Not a quote, but i go back to 'If' by Rudyard Kipling often and enjoy them in snippets. Here is one i always like:<p>If you can make one heap of all your winnings
And risk it on one turn of pitch-and-toss,
And lose, and start again at your beginnings
And never breathe a word about your loss;
I know where I'm going and I know the truth, and I don't have to be what you want me to be. I'm free to be what I want. Muhammad Ali<p>This quote was more related to Ali's joining the Nation of Islam, but in the Movie Ali this quote was referenced while Ali was talking to reporters about his conscientious objection. Especially because the US government wanted to make an Anti-American example out of Ali's refusal of the draft, but in reality people rallied behind Ali's decision which sparked the entire Anti-Vietnam movement.
The "Be the Change..." quote is a big one for me. But the biggest one is probably on the shirt I'm wearing today. "Inspiration is for amateurs. The rest of us just show up and get to work." - Chuck Close