[271] My view of this question is, as it happens, very simple. For since it is not in the nature of man to attain a science by the possession of which we can know positively what we should do or what we should say, in the next resort I hold that man to be wise who is able by his powers of conjecture to arrive generally at the best course, and I hold that man to be a philosopher who occupies himself with the studies from which he will most quickly gain that kind of insight.[138]