Two degrees are to be distinguished in the true or adequate knowledge of the intellect: rational knowledge attained through inference, and intuitive, self-evident knowledge; the latter has principles for its object, the former that which follows from them. Instead of operating with abstract concepts the reason uses common notions, notiones communes. Genera do not exist, but, no doubt, something common to all things. All bodies agree in being extended; all minds and ideas in being modes of thought; all beings whatever in the fact that they are modes of the divine substance and its attributes; "that which is common to all things, and which is equally in the part and in the whole, cannot but be adequately conceived." The ideas of extension, of thought, and of the eternal and infinite essence of God are adequate ideas. The adequate idea of each individual actual object involves the idea of God, since it can neither exist nor be conceived apart from God, and "all ideas, in so far as they are referred to God, are true." The ideas of substance and of the attributes are conceived through themselves, or immediately (intuitively) cognized; they are underivative, original, self-evident ideas.
There are thus three kinds, degrees, or faculties of cognition—sensuous or imaginative representation, reason, and immediate intuition. Knowledge of the second and third degrees is necessarily true, and our only means of distinguishing the true from the false. As light reveals itself and darkness, so the truth is the criterion of itself and of error. Every truth is accompanied by certainty, and is its own witness (II. prop. 43, schol.).—Adequate knowledge does not consider things as individuals, but in their necessary connection and as eternal sequences from the world-ground. The reason perceives things under the form of eternity: sub specie aeternitatis (II. prop. 44, cor. 2).
In his theory of the emotions, Spinoza is more dependent on Descartes than anywhere else; but even here he is guided by a successful endeavor after greater rigor and simplicity. He holds his predecessor's false concept of freedom responsible for the failure of his very acute inquiry. All previous writers on the passions have either derided, or bewailed, or condemned them, instead of investigating their nature. Spinoza will neither denounce nor ridicule human actions and appetites, but endeavor to comprehend them on the basis of natural laws, and to consider them as though the question concerned lines, surfaces, and bodies. He aims not to look on hate, anger, and the rest as flaws, but as necessary, though troublesome, properties of human nature, for which, as really as for heat and cold, thunder and lightning, a causal explanation is requisite.—As a determinate, finite being the mind is dependent in its existence and its activity on other finite things, and is incomprehensible without them; from its involution in the general course of nature the inadequate ideas inevitably follow, and from these the passive states or emotions; the passions thus belong to human nature, as one subject to limitation and negation.—The destruction of contingent and perishable things is effected by external causes; no one is destroyed by itself; so far as in it lies everything strives to persist in its being (III. prop. 4 and 6). The fundamental endeavor after self-preservation constitutes the essence of each thing (III. prop. 7). This endeavor (conatus) is termed will (voluntas) or desire (cupiditas) when it is referred to the mind alone, and appetite (appetitus) when referred to the mind and body together; desire or volition is conscious appetite (III. prop. 9, schol.). We call a thing good because we desire it, not desire a thing because we hold it good (cf. Hobbes, p. 75). To desire two further fundamental forms of the emotions are added, pleasure and pain. If a thing increases the power of our body to act, the idea of it increases the power of our soul to think, and is gladly imagined by it. Pleasure (laetitia) is the transition of a man to a greater, and pain (tristitia) his transition to a lesser perfection.
All other emotions are modifications or combinations of the three original ones, to which Spinoza reduces the six of Descartes (cf. p. 105). In the deduction and description of them his procedure is sometimes aridly systematic, sometimes even forced and artificial, but for the most part ingenious, appropriate, and psychologically acute. Whatever gives us pleasure augments our being, and whatever pains us diminishes it; hence we seek to preserve the causes of pleasurable emotions, and love them, to do away with the causes of painful ones, and hate them. "Love is pleasure accompanied by the idea of an external cause; hate is pain accompanied by the idea of an external cause." Since all that furthers or diminishes the being of (the cause of our pleasure) the object of our love, exercises at the same time a like influence on us, we love that which rejoices the object of our love and hate that which disturbs it; its happiness and suffering become ours also. The converse is true of the object of our hate: its good fortune provokes us and its ill fortune pleases us. If we are filled with no emotion toward things like ourselves, we sympathize in their sad or joyous feelings by involuntary imitation. Pity, from which we strive to free ourselves as from every painful affection, inclines us to benevolence or to assistance in the removal of the cause of the misery of others. Envy of those who are fortunate, and commiseration of those who are in trouble, are alike rooted in emulation. Man is by nature inclined to envy and malevolence. Hate easily leads to underestimation, love to overestimation, of the object, and self-love to pride or self-satisfaction, which are much more frequently met with than unfeigned humility. Immoderate desire for honor is termed ambition; if the desire to please others is kept within due bounds it is praised as unpretentiousness, courtesy, modesty (modestia). Ambition, luxury, drunkenness, avarice, and lust have no contraries, for temperance, sobriety, and chastity are not emotions (passive states), but denote the power of the soul by which the former are moderated, and which is discussed later under the name fortitudo. Self-abasement or humility is a feeling of pain arising from the consideration of our weakness and impotency; its opposite is self-complacency. Either of these may be accompanied by the (erroneous) belief that we have done the saddening or gladdening act of our own free will; in this case the former affection is termed repentance. Hope and fear are inconstant pleasure and pain, arising from the idea of something past or to come, concerning whose coming and whose issue we are still in doubt. There is no hope unmingled with fear, and no fear without hope; for he who still doubts imagines something which excludes the existence of that which is expected. If the cause of doubt is removed, hope is transformed into a feeling of confidence and fear into despair. There are as many kinds of emotions as there are classes among their objects or causes.
Besides the emotions to be termed "passions" in the strict sense, states of passivity, Spinoza recognizes others which relate to us as active. Only those which are of the nature of pleasure or desire belong to this class of active emotions; the painful affections are entirely excluded, since without exception they diminish or arrest the mind's power to think. The totality of these nobler impulses is called fortitudo (fortitude), and a distinction is made among them between animositas (vigor of soul) and generositas (magnanimity, noble-mindedness), according as rational desire is directed to the preservation of our own being or to aiding our fellow-men. Presence of mind and temperance are examples of the former, modesty and clemency of the latter. By this bridge, the idea of the active emotions, we may follow Spinoza into the field of ethics.
%(c) Practical Philosophy.%—Spinoza's theory of ethics is based on the equation of the three concepts, perfection, reality, activity (V. prop. 40, dem.). The more active a thing is, the more perfect it is and the more reality it possesses. It is active, however, when it is the complete or adequate cause of that which takes place within it or without it; passive when it is not at all the cause of this, or the cause only in part. A cause is termed adequate, when its effect can be clearly and distinctly perceived from it alone. The human mind, as a modus of thought, is active when it has adequate ideas; all its passion consists in confused ideas, among which belong the affections produced by external objects. The essence of the mind is thought; volition is not only dependent on cognition, but at bottom identical with it.
Descartes had already made the will the power of affirmation and negation. Spinoza advances a step further: the affirmation cannot be separated from the idea affirmed, it is impossible to conceive a truth without in the same act affirming it, the idea involves its own affirmation. "Will and understanding are one and the same" (II. prop. 49, cor.). For Spinoza moral activity is entirely resolved into cognitive activity. To the two stages of knowing, imaginatio and intellectus, correspond two stages of willing—desire, which is ruled by imagination, and volition, which is guided by reason. The passive emotions of sensuous desire are directed to perishable objects, the active, which spring from reason, have an eternal object—the knowledge of the truth, the intuition of God. For reason there are no distinctions of persons,—she brings men into concord and gives them a common end (IV. prop. 35-37,40),—and no distinctions of time (IV. prop. 62, 66), and in the active emotions, which are always good, no excess (IV. prop. 61). The passive emotions arise from confused ideas. They cease to be passions, when the confused ideas of the modifications of the body are transformed into clear ones; as soon as we have clear ideas, we become active and cease to be slaves of desire. We master the emotions by gaining a clear knowledge of them. Now, an idea is clear when we cognize its object not as an individual thing, but in its connection, as a link in the causal chain, as necessary, and as a mode of God. The more the mind conceives things in their necessity, and the emotions in their reference to God, the less it is passively subject to the emotions, the more power it attains over them: "Virtue is power" (IV. def. 8; prop. 20, dem.). It is true, indeed, that one emotion can be conquered only by another stronger one, a passive emotion only by an active one. The active emotion by which knowledge gains this victory over the passions is the joyous consciousness of our power (III. prop. 58, 59). Adequate ideas conceive their objects in union with God; thus the pleasure which proceeds from knowledge of, and victory over, the passions is accompanied by the idea of God, and, consequently (according to the definition of love), by love toward God (V. prop. 15, 32). The knowledge and love of God, together, "intellectual love toward God,"[1] is the highest good and the highest virtue (IV. prop. 28). Blessedness is not the reward of virtue, but virtue itself. The intellectual love of man toward God, in which the highest peace of the soul, blessedness, and freedom consist, and in virtue of which (since it, like its object and cause, true knowledge, is eternal), the soul is not included in the destruction of the body (V. prop. 23, 33), is a part of the infinite love with which God loves himself, and is one and the same with the love of God to man. The eternal part of the soul is reason, through which it is active; the perishable part is imagination or sensuous representation, through which it is passively affected. We are immortal only in adequate cognition and in love to God; more of the wise man's soul is immortal than of the fool's.
[Footnote 1: The conception amor Dei intellectualis in Spinoza is discussed in a dissertation by C. Lülmann, Jena, 1884.]
Spinoza's ethics is intellectualistic—virtue is based on knowledge.[1] It is, moreover, naturalistic—morality is a necessary sequence from human nature; it is a physical product, not a product of freedom; for the acts of the will are determined by ideas, which in their turn are the effects of earlier causes. The foundation of virtue is the effort after self-preservation: How can a man desire to act rightly unless he desires to be (IV. prop. 21, 22)? Since reason never enjoins that which is contrary to nature, it of necessity requires every man to love himself, to seek that which is truly useful to him, and to desire all that makes him more perfect. According to the law of nature all that is useful is allowable. The useful is that which increases our power, activity, or perfection, or that which furthers knowledge, for the life of the soul consists in thought (IV. prop. 26; app. cap. 5). That alone is an evil which restrains man from perfecting the reason and leading a rational life. Virtuous action is equivalent to following the guidance of the reason in self-preservation (IV. prop. 24).—Nowhere in Spinoza are fallacies more frequent than in his moral philosophy; nowhere is there a clearer revelation of the insufficiency of his artificially constructed concepts, which, in their undeviating abstractness, are at no point congruent with reality. He is as little true to his purpose to exclude the imperative element, and to confine himself entirely to the explanation of human actions considered as facts, as any philosopher who has adopted a similar aim. He relieves the inconsistency by clothing his injunctions under the ancient ideal of the free wise man. This, in fact, is not the only thing in Spinoza which reminds one of the customs of the Greek moralists. He renews the Platonic idea of a philosophical virtue, and the opinion of Socrates, that right action will result of itself from true insight. Arguing from himself, from his own pure and strong desire for knowledge, to mankind in general, he makes reason the essence of the soul, thought the essence of reason, and holds the direction of the impulse of self-preservation to the perfection of knowledge, which is "the better part of us," to be the natural one.
[Footnote 1: That virtue which springs from knowledge is alone genuine. The painful, hence unactive, emotions of pity and repentance may impel to actions whose accomplishment is better than their omission. Emotion caused by sympathy for others and contrition for one's own guilt, both of which increase present evil by new ones, have only the value of evils of a lesser kind. They are salutary for the irrational man, in so far as the one spurs him on to acts of assistance and the other diminishes his pride. They are harmful to the wise man, or, at least, useless; he is in no need of irrational motives to rational action. Action from insight is alone true morality.]