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

Whether you think you can, or you think you can't - you're right.

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

I do not want to die rusting, I prefer to burn out.

Duty does not require any person to submit to the destruction of his personal ambitions and the right to live his own life in his own way.

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.

The past cannot be changed. The future is yet in your power.

Weakness of attitude becomes weakness of character.

Only the wisest and stupidest of men never change.

Always remember you are braver than you believe, stronger than you seem, smarter than you think and twice as beautiful as you’ve ever imagined.

When you believe in a thing, believe in it all the way, implicitly and unquestionably.

The expectations of life depend upon diligence; the mechanic that would perfect his work must first sharpen his tools.

Know thyself.

Waiting hurts. Forgetting hurts. But not knowing which decision to take is the worst of suffering

When you're at the end of your rope, tie a knot and hold on

Don't let anyone tell you what you ought to like... Some wines that some experts think are absolutely exquisite don't appeal to me at all.

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

Sincerity and truth are the basis of every virtue.

If I find 10,000 ways something won't work, I haven't failed. I am not discouraged, because every wrong attempt discarded is another step forward.

Don't ever take a fence down until you know why it was put up.

Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present.