27. The philosophers considered that duties Cic. de Off. I. 3, § 9. were derived from what is virtuous and what is useful, and that from these two one should choose the better. Then, they say, it may happen that two virtuous or two useful things will clash together, and the question is, which is the more virtuous, and which the more useful? First, therefore, “duty” is divided into three sections: what is virtuous, what is useful, and what is the better of two. Then, again, these three are divided into five classes; that is, two that are virtuous, two that are useful, and, lastly, the right judgment as to the choice between them. The first they say has to do with the moral dignity and integrity of life; the second with the conveniences of life, with wealth, resources, opportunities; whilst a right judgment must underlie the choice of any of them. This is what the philosophers say. Cic. de Off. I. 3.