Human Nature And The Stoics

William Edward Lecky, History of European Morals From Augustus to Charlemagne, vol. I., (New York: 3rd edt., 1897), ch. 2, The Pagan Empire:

In truth, the Stoics, who taught that all virtue was conformity to nature, were, in this respect, eminently false to their own principle. Human nature, as revealed to us by reason, is a composite thing, a constitution of many parts differing in kind and dignity, a hierarchy in which many powers are intended to co-exist, but in different positions of ascendancy or subordination. To make the higher part of our nature our whole nature, is not to restore but to mutilate humanity, and this mutilation has never been attempted without producing grave evils. As philanthropists, the Stoics, through their passion for unity, were led to the extirpation of those emotions which nature intended as the chief springs of benevolence. As speculative philosophers, they were entangled by the same desire in a long train of pitiable paradoxes. Their famous doctrines that all virtues are equal, or, more correctly, are the same, that all vices are equal, that nothing is an evil which does not affect our will, and that pain and bereavement are, in consequence, no ills, though partially explained away and frequently disregarded by the Roman Stoics, were yet sufficiently prominent to give their teaching something of an unnatural and affected appearance. Prizing only a single object, and developing only a single side of their nature, their minds became narrow and their views contracted.