Lives of Eminent Philosophers 7.109 — Diogenes Laërtius on the Stoics

Diogenes Laërtius, Lives of Eminent Philosophers 7.109

Reported speech · Diogenes Laërtius on the Stoics

Unbefitting, or contrary to duty, are all acts that reason deprecates, e.g. to neglect one’s parents, to be indifferent to one’s brothers, not to agree with friends, to disregard the interests of one’s country, and so forth. Acts which fall under neither of the foregoing classes are those which reason neither urges us to do nor forbids, such as picking up a twig, holding a style or a scraper, and the like. Again, some duties are incumbent unconditionally, others in certain circumstances. Unconditional duties are the following: to take proper care of health and one’s organs of sense, and things of that sort. Duties imposed by circumstances are such as maiming oneself and sacrifice of property. And so likewise with acts which are violations of duty. Another division is into duties which are always incumbent and those which are not. To live in accordance with virtue is always a duty, whereas dialectic by question and answer or walking-exercise and the like are not at all times incumbent. The same may be said of the violations of duty.