Epicurus, as recorded in Seneca's letter to Lucilius 22:
Read the letter of Epicurus which appears on this matter; it is addressed to Idomeneus. The writer asks him to hasten as fast as he can, and beat a retreat before some stronger influence comes between and takes from him the liberty to withdraw. But he also adds that one should attempt nothing except at the time when it can be attempted suitably and seasonably. Then, when the long-sought occasion comes, let him be up and doing. Epicurus forbids us to doze when we are meditating escape; he bids us hope for a safe release from even the hardest trials, provided that we are not in too great a hurry before the time, nor too dilatory when the time arrives.
Thomas Jefferson, as recorded in his letter to William Short, October 31, 1818:
I take the liberty of observing that you are not a true disciple of our master Epicurus, in indulging the indolence to which you say you are yielding. One of his canons, you know, was that “that indulgence which prevents a greater pleasure, or produces a greater pain, is to be avoided.” Your love of repose will lead, in its progress, to a suspension of healthy exercise, a relaxation of mind, an indifference to everything around you, and finally to a debility of body, and hebetude of mind, the farthest of all things from the happiness which the well-regulated indulgences of Epicurus ensure; fortitude, you know is one of his four cardinal virtues. That teaches us to meet and surmount difficulties; not to fly from them, like cowards; and to fly, too, in vain, for they will meet and arrest us at every turn of our road. Weigh this matter well; brace yourself up....