It's always too early to quit.
If you can dream it, you can do it.
Things do not happen. Things are made to happen.
Either you run the day or the day runs you.
The most effective way to do it, is to do it.
The wise does at once what the fool does at last.
Do not weep do not wax indignant. Understand.
Always desire to learn something useful.
Wherever you are - be all there.
The dog that trots about finds a bone.
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.