In order to explain these differences, it would be an endless work to examine every emotion and passion in particular. We must be satisfied at present with some general views. And with respect to emotions, which are quiescent and not productive of desire, their growth and decay are easily explained. An emotion caused by an external object, cannot naturally take longer time to arrive at perfection, than is necessary for a leisurely survey. Such emotion also must continue long stationary, without any sensible decay; a second or third view of the object being nearly as agreeable as the first. This is the case of an emotion produced by a fine prospect, an impetuous river, or a towering hill. While a man remains the same, such objects ought to have the same effect upon him. Familiarity, however, hath an influence here, as it hath every where. Frequency of view, after short intervals especially, weans the mind gradually from the object, which at last loses all relish. The noblest object in the material world, a clear and serene sky, is quite disregarded, unless perhaps after a course of bad weather. An emotion raised by human virtues, qualities, or actions, may grow imperceptibly by reiterated views of the object, till it become so vigorous as to generate desire. In this condition it must be handled as a passion.
As to passion, I observe first, that when nature requires a passion to be sudden, it is commonly produced in perfection. This is frequently the case of fear and of anger. Wonder and surprise are always produced in perfection. Reiterated impressions made by their cause, exhaust these passions in place of inflaming them. This will be explained afterward[34].
In the next place, when a passion hath for its foundation an original propensity peculiar to some men, it generally comes soon to perfection. The propensity, upon representing a proper object, is immediately enlivened into a passion. This is the case of pride, of envy, and of malice.
In the third place, love and hatred have often a slow growth. The good qualities or kind offices of a person, raise in me pleasant emotions; which, by reiterated views, are swelled into a passion involving desire of that person’s happiness. This desire being often put in exercise, works gradually a change internally; and at last produceth in me a settled habit of affection for that person, now my friend. Affection thus produced, operates precisely like an original propensity. To enliven it into a passion, no more is required but the real or ideal presence of the object. The habit of aversion or hatred is brought on in the same manner. And here I must observe by the way, that love and hatred signify commonly affection, not passion. The bulk indeed of our passions, are these affections inflamed into a passion by different circumstances. The affection of love I bear to my son, is inflamed into the passion of fear, when he is in danger; becomes hope, when he hath a prospect of good fortune; becomes admiration, when he performs a laudable action; and shame, when he commits any wrong. Aversion, again, becomes fear when there is a prospect of good fortune to my enemy; becomes hope when he is in danger; becomes joy when he is in distress; and sorrow when a laudable action is performed by him.
Fourthly, the growth of some passions depends often on occasional circumstances. Obstacles to gratification never fail to augment and inflame a passion. A constant endeavour to remove the obstacle, preserves the object of the passion ever in view, which swells the passion by impressions frequently reiterated. Thus the restraint of conscience, when an obstacle to love, agitates the mind and inflames the passion:
Quod licet, ingratum est: quod non licet, acrius urit.
Si nunquam Danaën habuisset ahenea turris,
Non esset Danaë de Jove facta parens.
Ovid. Amor. l. 2.
At the same time, the mind distressed with the obstacle, is disposed to indulge its distress by magnifying the pleasure of gratification; which naturally inflames desire. Shakespear expresses this observation finely:
All impediments in fancy’s course,
Are motives of more fancy.
We need no better example than a lover who hath many rivals. Even the caprices of a mistress have the effect to inflame love. These occasioning uncertainty of success, tend naturally to make the anxious lover overvalue the happiness of fruition.
So much upon the growth of passions. Their continuance and decay come next under consideration. And first, it is a general law of nature, that things sudden in their growth, are equally sudden in their decay. This is commonly the case of anger; and with respect to wonder and surprise, another reason concurs, that their causes are of short duration. Novelty soon degenerates into familiarity; and the unexpectedness of an object, is soon sunk in the pleasure which the object affords us. Fear, which is a passion of greater importance as tending to self-preservation, is often instantaneous, and yet is of equal duration with its cause. Nay it frequently subsists after the cause is removed.