It's always too early to quit.
Leap, and the net will appear.
Be gentle to all and stern with yourself.
Things do not happen. Things are made to happen.
To be a good loser is to learn how to win.
Go for it now. The future is promised to no one.
Who seeks shall find.
What you do today can improve all your tomorrows.
After a storm comes a calm.
The wise does at once what the fool does at last.
The answer to old age is to keep one's mind busy and to go on with one's life as if it were interminable. I always admired Chekhov for building a new house when he was dying of tuberculosis.