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

What does not destroy me, makes me strong.

My heroes are the ones who survived doing it wrong, who made mistakes, but recovered from them.

Stand up to your obstacles and do something about them. You will find that they haven't half the strength you think they have.

I'd rather be hated for who I am, than loved for who I am not.

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.

When written in Chinese, the word 'crisis' is composed of two characters. One represents danger, the other opportunity.

Great work requires great and persistent effort for a long time. … Character has to be established through a thousand stumbles.

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

Every problem is a gift - without problems we would not grow.

Everything you can imagine is real.

Alone we can do so little; together we can do so much.

I am as bad as the worst, but, thank God, I am as good as the best.

The fact that the great scientist believed in flying machines was the one thing that encouraged us to begin our studies.

Identify your problems but give your power and energy to solutions

When they say the sky's the limit to me that's really true

For every man there exists a bait which he cannot resist swallowing.

It's always too early to quit.

Determine never to be idle. No person will have occasion to complain of the want of time, who never loses any. It is wonderful how much may be done, if we are always doing.

It is better to light one small candle than to curse the darkness.

Keep your face to the sunshine and you will never see the shadow.