LXII. Again, they say that that is duty, which is preferred, and which contains in itself reasonable arguments why we should prefer it; as for instance, its corresponding to the nature of life itself; and this argument extends to plants and animals, for even their nature is subject to the obligation of certain duties. And duty (τὸ καθῆκον) had this name given to it by Zeno, in the first instance, its appellation being derived from its coming to, or according to some people, ἀπὸ τοῦ κατά τινας ἥκειν; and its effect is something kindred to the preparations made by nature. Now of the things done according to inclination, some are duties, and some are contrary to duty; and some are neither duties nor contrary to duty. Those are duties, which reason selects to do, as for instance, to honour one’s parents, one’s brothers, one’s country, to gratify one’s friends. Those actions are contrary to duty, which reason does not choose; as for instance, to neglect one’s parents, to be indifferent to one’s brothers, to shirk assisting one’s friends, to be careless about the welfare of one’s country, and so on. Those are neither duties, nor contrary to duty, which reason neither selects to do, nor, on the other hand, repudiates, such actions, for instance, as to pick up straw, to hold a pen, or a comb, or things of that sort. Again, there are some duties which do not depend on circumstances, and some which do. These do not depend on circumstances, to take care of one’s health, and of the sound state of one’s senses, and the like. Those which do depend on circumstances, are the mutilation of one’s members, the sacrificing of one’s property, and so on. And the case of those actions which are contrary to duty, is similar. Again, of duties, some are always such, and some are not always. What is always a duty, is to live in accordance with virtue; but to ask questions, to give answers, to walk, and the like, are not always duties. And the same statement holds good with respect to acts contrary to duty. There is also a class of intermediate duties, such as the duty of boys obeying their masters.