The past cannot be changed. The future is yet in your power.
The beautiful thing about learning is that no one can take it away from you.
Yesterday is gone. Tomorrow has not yet come. We have only today. Let us begin.
Don't watch the clock; do what it does. Keep going.
The only real mistake is the one from which we learn nothing.
It is never too late to be what you might have been.
Learn as if you will live forever, live like you will die tomorrow.
It's not that I'm so smart, it's just that I stay with problems longer.
Life can only be understood backward, but it must be lived forward.
The best way to predict the future is to create it.
It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change.
Every exit is an entry somewhere else.
You don't make progress by standing on the sidelines, whimpering and complaining. You make progress by implementing ideas.
Experience is not what happens to you; it's what you do with what happens to you.
What you get by achieving your goals is not as important as what you become by achieving your goals.
The only time you should ever look back is to see how far you've come.
The only limit to our realization of tomorrow will be our doubts of today.
Your past does not equal your future.
The more I learn, the more I realize how much I don't know.
In three words I can sum up everything I've learned about life: it goes on.