4
For it is the part of a wise and well-educated man, not to be transported beyond himself with any prosperous events, and so, when the scene of fortune changeth, to observe still the comeliness and decency of his morals. For it is the business of a man that lives by rule, either to prevent an evil that threatens him, or, when it is come, to qualify its malignity and make it as little as he can, or put on a masculine brave spirit and so resolve to endure it. For there are four ways that prudence concerns herself about any thing that is good; she is either industrious to acquire or careful to preserve, she either augments or useth it well. These are the measures of prudence, and consequently those of all other virtues, by which we ought to square ourselves in either fortune. For no man lives who always happy is. From the Stheneboea of Euripides, Frag. 632.
4
And, by Jove, you should not hinder what ought to be done,— Those things which in their nature ought to be. From Euripides.