In any moment of decision, the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore Roosevelt
Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible.
Francis of Assisi
If I have seen further than others, it is by standing upon the shoulders of giants.
Isaac Newton
What great thing would you attempt if you knew you could not fail?