But if anything in thy own dispositiongives thee pain, who hinders thee from correcting thy opinion? And even if thou art pained because thou art not doing some particular thing which seems to thee to be right, why dost thou not rather act than complain?- But some insuperable obstacle is in the way?- Do not be grieved then, for the cause of its not being done depends not on thee.- But it is not worth while to live if this cannot be done.- Take thy departure then from life contentedly, just as he dies who is in full activity, and well pleased too with the things which are obstacles.
Marcus AureliusOur life is what our thoughts make it. Do every act of your life as if it were your last. In a word, your life is short. You must make the most of the present with the aid of reason and justice. Since it is possible that you may be quitting life this very moment, govern every act and thought accordingly.
Marcus Aurelius