Meditations by Marcus Aurelius Book 9 Page 34

then that which is impossible. For this one, (thou must think) whosoever he be, is one of those impudent ones, that the world cannot be without. So of the subtile and crafty, so of the perfidious, so of every one that offendeth, must thou ever be ready to reason with thyself. For whilst in general thou dost thus reason with thyself, that the kind of them must needs be in the world, thou wilt be the better able to use meekness towards every particular.

This also thou shalt find of very good use, upon every such occasion, presently to consider with thyself, what proper virtue nature hath furnished man with, against such a vice, or to encounter with a disposition vicious in this kind. As for example, against the unthankful, it hath given goodness and meekness, as an antidote, and so against another vicious in another