Self-confidence is the first requisite to great undertakings.

In a conflict between the heart and the brain, follow your heart.

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

I hope our wisdom will grow with our power, and teach us that the less we use our power the greater it will be.

Cultivate your curves - they may be dangerous but they won't be avoided.

Change will not come if we wait for some other person, or if we wait for some other time. We are the ones we've been waiting for. We are the change that we seek.

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

I hated every minute of training, but I said, 'Don't quit. Suffer now and live the rest of your life as a champion'.

A superior man is modest in his speech, but exceeds in his actions.

Courage is the thing. All goes if courage goes.

All the darkness in the world cannot extinguish the light of a single candle.

In essence, if we want to direct our lives, we must take control of our consistent actions. It's not what we do once in a while that shapes our lives, but what we do consistently.

Whatever you do will be insignificant, but it is very important that you do it.

Everything I've ever done was out of fear of being mediocre.

I don't know who my grandfather was; I'm much more concerned to know what his grandson will be.

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

Humans have come into being for the sake of each other, so either teach them, or learn to bear them.

Memories of our lives, of our works and our deeds will continue in others.

I long to accomplish a great and noble task; but it is my chief duty to accomplish small tasks as if they were great and noble

Identify your problems but give your power and energy to solutions

A man is but the product of his thoughts. What he thinks, he becomes.