Meditation 8.47
47. If you suffer pain because of some external cause, what troubles you is not the thing but your decision about it, and this it is in your power to wipe out at once. But if what pains you is something in your own disposition, who prevents you from correcting your judgement? And similarly, if you are pained because you fail in some particular action which you imagine to be sound, why not continue to act rather than to feel pain? 'But something too strong for you opposes itself'. Then do not be pained, for the reason why the act is not done does not rest with you. 'Well, but if this be left undone, life is not worth living.' Depart then from life in a spirit of good will, even as he dies who achieves his end, contented, too, with what opposes you.