We are citizens of the world. The tragedy of our times is that we do not know this.
The world is the great gymnasium where we come to make ourselves strong.
No great discovery was ever made without a bold guess.
It's always too early to quit.
Employ your time in improving yourself by other men's writings so that you shall come easily by what others have labored hard for.
Man needs his difficulties because they are necessary to enjoy success.
With realization of one's own potential and self-confidence in one's ability, one can build a better world.
The great secret of true success, of true happiness, is this: the man or woman who asks for no return, the perfectly unselfish person, is the most successful.
The secret to creativity is knowing how to hide your sources.
Once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return.
He was a dreamer, a thinker, a speculative philosopher... or, as his wife would have it, an idiot.
I can be changed by what happens to me. But I refuse to be reduced by it.
If you're not prepared to be wrong, you'll never come up with anything original.
Sovereignty is not given, it is taken.
Gratitude is an illness suffered by dogs.
The man with no imagination has no wings.
If you spend too much time thinking about a thing, you'll never get it done.
In life, you need either inspiration or desperation.
I hated every minute of training, but I said, 'Don't quit. Suffer now and live the rest of your life as a champion'.
Improvement makes strait roads, but the crooked roads without Improvement, are roads of Genius.
The crisis of today is the joke of tomorrow.