Courage is the most important of all the virtues, because without courage you can't practice any other virtue consistently. You can practice any virtue erratically, but nothing consistently without courage.
I can never stand still. I must explore and experiment. I am never satisfied with my work. I resent the limitations of my own imagination.
What does not destroy me, makes me strong.
Without ambition one starts nothing. Without work one finishes nothing. The prize will not be sent to you. You have to win it.
A lot of people have gone further than they thought they could because someone else thought they could
To go too far is as bad as to fall short.
Don't get set into one form, adapt it and build your own, and let it grow, be like water.
You are never too old to become younger!
Memories of our lives, of our works and our deeds will continue in others.
If you want creative workers, give them enough time to play.
It may have been in pieces, but I gave you the best of me.
I think nature's imagination Is so much greater than man's, she's never going to let us relax.
To succeed in your mission, you must have single-minded devotion to your goal.
What I stand for is what I stand on.
Don't ever take a fence down until you know why it was put up.
Others have seen what is and asked why. I have seen what could be and asked why not.
They say Rome wasn't built in a day, but I wasn't on that particular job.
The limits of the possible can only be defined by going beyond them into the impossible.
Employ your time in improving yourself by other men's writings so that you shall come easily by what others have labored hard for.
It is only when the mind is free from the old that it meets everything anew, and in that there is joy.
We cannot solve our problems with the same thinking we used when we created them.