No great discovery was ever made without a bold guess.

Keep your eyes on the stars, and your feet on the ground.

Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young.

Differences are not intended to separate, to alienate. We are different precisely in order to realize our need of one another.

We do not consider our principles as dogmas contained in books said to come from heaven. We derive our inspiration, not from heaven, or the unseen world, but directly from life.

Do not count your chickens before they are hatched.

If you spend too much time thinking about a thing, you'll never get it done.

A liar will not be believed even when he speaks the truth.

Hating people because of their color is wrong. And it doesn't matter which color does the hating. It's just plain wrong.

Crave for a thing, you will get it. Renounce the craving, the object will follow you by itself.

Perseverance is failing 19 times and succeeding the 20th.

If you don't like the road you're walking, start paving another one.

In winter, I plot and plan. In spring, I move.

All wealth is the product of labor.

Don't hit at all if it is honorably possible to avoid hitting; but never hit soft!

As long as I'm in great shape, nobody beats me, for sure.

Nothing is impossible, the word itself says 'I am possible'

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'm not telling you it's going to be easy - I'm telling you it's going to be worth it.

Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious.

Others have seen what is and asked why. I have seen what could be and asked why not.