Isn't it astonishing that all these secrets have been preserved for so many years just so we could discover them!

Diligence is the mother of good fortune. And idleness, its opposite, never brought a man to the goal of any of his best wishes.

If you put off everything till you're sure of it, you'll never get anything done.

Character isn't something you were born with and can't change, like your fingerprints. It's something you weren't born with and must take responsibility for forming.

If the only tool you have is a hammer, you tend to see every problem as a nail.

You have to work hard to get to the top of your game. I think every writer has doubts! I still do all the time.

The secret of genius is to carry the spirit of the child into old age, which means never losing your enthusiasm.

No great discovery was ever made without a bold guess.

Question with boldness even the existence of God; because, if there be one, he must more approve of the homage of reason than that of blindfolded fear.

You shape your own destiny.

Defeat is not defeat unless accepted as a reality-in your own mind.

If you don't know, the thing to do is not to get scared, but to learn.

Man needs his difficulties because they are necessary to enjoy success.

Imperfection is beauty, madness is genius and it's better to be absolutely ridiculous than absolutely boring.

We cannot do everything at once, but we can do something at once.

To See a World in a Grain of Sand And a Heaven in a Wild Flower, Hold Infinity in the palm of your hand And Eternity in an hour.

Though the road's been rocky it sure feels good to me.

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

I confess that in 1901 I said to my brother Orville that man would not fly for fifty years.

It is only when the mind is free from the old that it meets everything anew, and in that there is joy.

The limits of the possible can only be defined by going beyond them into the impossible.