And in the same way to make trial of me, Rufus used to say, "Such and such a thing will befall you at the hands of your master." In answer to him, I said that in such a case it would be kind of him (to intercede in my behalf.) "What!" he exclaimed, "Do you mean that I should intercede in your behalf when I can get the same result from you yourself?" For in truth what one can get from himself it is superfluous and foolish as well to get from someone else.1
Musonius Rufus, Lectures and Fragments, Fragment 45, translated by Cora E. Lutz (1947). The Stoic Library.