No one who desires to become good will become good unless he does good things.

It is during our darkest moments that we must focus to see the light.

Happiness depends upon ourselves.

Educating the mind without educating the heart is no education at all.

Adventure is worthwhile.

Patience is bitter, but its fruit is sweet.

Love is composed of a single soul inhabiting two bodies.

Education is an ornament in prosperity and a refuge in adversity.

Be a free thinker and don't accept everything you hear as truth. Be critical and evaluate what you believe in.

Knowing yourself is the beginning of all wisdom.

Criticism is something we can avoid easily by saying nothing, doing nothing, and being nothing.

... the courage of one's opinions is always a form of calculating cowardice in the eyes of the 'other side'...

I had been impressed by the fact that biological systems were based on molecular machines and that we were learning to design and build these sorts of things.

The man who comes up with a means for doing or producing almost anything better, faster or more economically has his future and his fortune at his fingertips.

Cuba is such a beautiful country, and everywhere you go, there's music and people dancing - especially in Havana.

This moment is timeless, yet it is always new.

The most radical, audacious thing to think is that there might be some point to working hard and thinking hard and reading hard and writing hard and trying to be of service

I think that someone is watching out for me, God, my guardian angel, I'm not sure who that is, but they really work hard.

There is no gain so certain as that which arises from sparing what you have.

All you touch and all you see is all your life will ever be.

When you get up, the night and day is a contradiction. But you get up at 4 a.m. — that first blush of blue is where the night and day are trying to find harmony with each other.