Be thine own palace, or the world's thy jail.
Do not weep do not wax indignant. Understand.
Never complain and never explain.
Either you run the day or the day runs you.
It's always too early to quit.
Always desire to learn something useful.
Begin to be now what you will be hereafter.
If you think you can do it, you can.
Go for it now. The future is promised to no one.
What you do today can improve all your tomorrows.
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.