Plutarch De Sera Numinis Vindicta 21

[21] What shall I say? But even a little before we were offended at the Gods protracting and delaying the punishments of the wicked, and now we are as much displeased that they do not curb and chastise the depravities of an evil disposition before the fact committed; not considering that many times a mischief contrived for future execution may prove more dreadful than a fact already committed, and that dormant villany may be more dangerous than open and apparent iniquity; not being able to apprehend the reason wherefore it is better to bear with the unjust actions of some men, and to prevent the meditating and contrivance of mischief in others. As, in truth, we do not rightly comprehend why some remedies and physical drugs are no way convenient for those that labor under a real disease, yet wholesome and profitable for those that are seemingly in health, but yet perhaps in a worse condition than they who are sick. Whence it comes to pass, that the Gods do not always turn the transgressions of parents upon their children; but if a virtuous son happen to be the offspring of a wicked father,—as often it falls out that a sane child is born of one that is unsound and crazy,—such a one is exempted from the punishment which threatens the whole descent, as having been adopted into a virtuous family. But for a young man that treads in the footsteps of a criminal race, it is but just that he should succeed to the punishment of his ancestor’s iniquity, as one of the debts attached to his inheritance. For neither was Antigonus punished for the crimes of Demetrius; nor (among the ancient heroes) Phyleus for the transgressions of Augeas, nor Nestor for the impiety of Neleus; in regard that, though their parents were wicked, yet they were virtuous themselves. But as for those whose nature has embraced and espoused the vices of their parentage, them holy vengeance prosecutes, pursuing the likeness and resemblance of sin. For as the warts and moles and freckles of parents, not seen upon the children of their own begetting, many times afterwards appear again upon the children of their sons and daughters; and as the Grecian woman that brought forth a blackamore infant, for which she was accused of adultery, proved herself, upon diligent inquiry, to be the offspring of an Ethiopian after four generations; and as among the children of Pytho the Nisibian,—said to be descended from the Sparti, that were the progeny of those men that sprung from the teeth of Cadmus’s dragon,—the youngest of his sons, who lately died, was born with the print of a spear upon his body, the usual mark of that ancient line, which, not having been seen for many revolutions of years before, started up again, as it were, out of the deep, and showed itself the renewed testimonial of the infant’s race; so many times it happens that the first descents and eldest races hide and drown the passions and affections of the mind peculiar to the family, which afterward bud forth again, and display the natural propensity of the succeeding progeny to vice or virtue.