Zoroaster’s doctrine agreed in every respect with Plato’s; for besides Oomazes, the good, and Arimanius, the evil principle, he taught that there was a third, or mediatory one, called Mithras. That it never became any part of the popular belief in Greece or Italy is quite clear. All the polytheism of those countries recognized each of the gods as authors alike of good and evil. Nor did even the chief of the divinities, under whose power the rest were placed, offer any exception to the general rule; for Jupiter not only gave good from one urn and ill from another, but he was also, according to the barbarous mythology of classical antiquity, himself a model at once of human perfections and of human vices.

After the light of the Christian religion had made some way toward supplanting the ancient polytheism, the doctrine of two principles was broached; first by Marcion, who lived in the time of Adrian and Antonius Pius, early in the second century; and next by Manes, a hundred years later. He was a Persian slave, who was brought into Greece, where he taught this doctrine, since known by his name, having learned it, as is said, from Scythianus, an Arabian. The Manichean doctrines, afterwards called also Paulician, from a great teacher of them in the seventh century, were like almost all the heresies in the primitive church, soon mixed up with gross impurities of sacred rites as well as extravagant absurdities of creed.

The Manicheans were, probably as much on this account as from the spirit of religious intolerance, early the objects of severe persecution; and the Code of Justinian itself denounces capital punishment against any of the sect, if found within the Roman dominions.

It must be confessed that the theory of two principles, when kept free from the absurdities and impurities which were introduced into the Manichean doctrine, is not unnaturally adopted by men who have no aid from the light of revelation,[1] and who are confounded by the appearance of a world where evil and good are mixed together, or seem to struggle with one another, sometimes the one prevailing, and sometimes the other; and accordingly, in all countries, in the most barbarous nations, as well as among the most refined, we find plain traces of reflecting men having been driven to this solution of the difficulty.

It seems upon a superficial view to be very easily deducible from the phenomena; and as the idea of infinite power, with which it is manifestly inconsistent, does by no means so naturally present itself to the mind, as long as only a very great degree of power, a power which in comparison of all human force may be termed infinite, is the attribute with which the Deity is believed to be endued. Manichean hypothesis is by no means so easily refuted. That the power of the Deity was supposed to have limits even in the systems of the most enlightened heathens is unquestionable. They, generally speaking, believed in the eternity of matter, and conceived some of its qualities to be so essentially necessary to its existence that no divine agency could alter them. They ascribed to the Deity a plastic power, a power not of creating or annihilating, but only of moulding, disposing and moving matter. So over mind they generally give him the like power, considering it as a kind of emanation from his own greater mind or essence, and destined to be re-united with him hereafter. Nay, over all the gods, and of superior potency to any, they conceived fate to preside; an overruling and paramount necessity, of which they formed some dark conceptions, and to which the chief of all the gods was supposed to submit. It is, indeed, extremely difficult to state precisely what the philosophic theory of theology was in Greece and Rome, because the wide difference between the esoteric and exoteric doctrines, between the belief of the learned few and the popular superstition, makes it very difficult to avoid confounding the two, and lending to the former some of the grosser errors with which the latter abounded. Nevertheless, we may rely upon what has been just stated, as conveying, generally speaking, the opinion of philosophers, although some sects certainly had a still more scanty measure of belief.

But we shall presently find that in the speculation of the much more enlightened moderns, Christians of course, errors of a like kind are to be traced. They constantly argue the great question of evil upon a latent assumption, that the power of the Deity is restricted by some powers or qualities inherent in matter; notions analogous to that of faith are occasionally perceptible; not stated or expanded indeed into propositions, but influencing the course of the reasoning; while the belief of infinite attributes is never kept steadily in view, except when it is called in as requisite to refute the Manichean doctrines. Some observers of the controversy have indeed not scrupled to affirm that those of whom we speak are really Manicheans without knowing it; and build their systems upon assumptions secretly borrowed from the disciples of Zoroaster, without ever stating those assumptions openly in the form of postulates or definition.

The refutation of the Manichean hypothesis is extremely easy if we be permitted to assume that both the principles which it supposes are either of infinite power or of equal power. If they are of infinite power, the supposition of their co-existence involves a contradiction in terms; for the one being in opposition to the other, the power of each must be something taken from that of the other; consequently neither can be of infinite power. If, again, we only suppose both to be of equal power, and always acting against each other, there could be nothing whatever done, neither good or evil; the universe would be at a standstill; or rather no act of creation could ever have been performed, and no existence could be conceived beyond that of the two antagonistic principles.

Archbishop Tillotson’s argument, properly speaking, amounts to this last proposition, and is applicable to equal and opposite principles, although he applies it to two beings, both infinitely powerful and counteracting one another. When he says they would tie up each other’s bands, he might apply this argument to such antagonistic principles if only equal, although not infinitely powerful. The hypothesis of their being both infinitely powerful needs no such refutation; it is a contradiction in terms. But it must be recollected that the advocates of the Manichean doctrine endeavor to guard themselves against the attack by contending, that the conflict between the two principles ends in a kind of compromise, so that neither has it all his own way; there is a mixture of evil admitted by the good principle, because else the whole would beat a standstill; while there is much good admitted by the evil principle, else nothing, either good or evil, would be done. Another answer is therefore required to this theory than what Tillotson and his followers have given.

First, we must observe that this reasoning of the Manicheans proceeds upon the analogy of what we see in mortal contentions; where neither party having the power to defeat the other, each is content to yield a little to his adversary, and so, by mutual concession, both are successful to some extent, and both to some extent disappointed. But in a speculation concerning the nature of the Deity, there seems no place for such notions.

Secondly, the equality of power is not an arbitrary assumption; it seems to follow from the existence of the two opposing principles. For if they are independent of one another as to existence, which they must needs be, else one would immediately destroy the other, so must they also, in each particular instance, be independent of each other, and also equal each to the other, else one would have the mastery, and the influence of the other could not be perceived. To say that in some things the good principle prevails and in others the evil, is really saying nothing more than that good exists here and evil there. It does not further the argument one step, nor give anything like an explanation. For it must always be borne in mind that the whole question respecting the Origin of Evil proceeds upon the assumption of a wise, benevolent and powerful Being having created the world. The difficulty, and the only difficulty, is, how to reconcile existing evil with such a Being’s attributes; and if the Manichean only explains this by saying the good Being did what is good, and another and evil Being did what is bad in the universe, he really tells us nothing more than the fact; he does not apply his explanation to the difficulty; and he supposes the existence of a second Deity gratuitously and to no kind of purpose.