Have the wisdom to know what cannot be changed, and the strength to change what can.
We are not disturbed by what happens to us, but by our thoughts about what happens to us.
If any be unhappy, let him remember that he is unhappy by reason of himself alone. For God hath made all men to enjoy felicity and constancy of good.
If you want to improve, be content to be thought foolish and stupid.
Consider first the nature of the business in hand; then examine thy own nature, whether thou hast strength to undertake it.
No great thing is created suddenly.