I find these lines from the poem "If" by Rudyard Kipling the most inspirational of all:

Or watch the things you gave your life to, broken,

And stoop and build ’em up with worn-out tools:

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;