There are four million different kinds of animals and plants in the world. That’s four million solutions to the problem of staying alive.

Challenging the meaning of life is the truest expression of the state of being human.

The world would be happier if men had the same capacity to be silent that they have to speak.

It is a waste of energy to be angry with a man who behaves badly, just as it is to be angry with a car that won't go.

Man has the power to act as his own destroyer - and that is the way he has acted through most of his history.

In spite of everything, I still believe that people are really good at heart.

Great men are like eagles, and build their nest on some lofty solitude.

Anyone who says he can see through women is missing a lot.

I despise people who depend on these things [heroin and cocaine]. If you really want a mind-altering experience, look at a tree.

What sunshine is to flowers, smiles are to humanity. These are but trifles, to be sure; but scattered along life's pathway, the good they do is inconceivable.

There is no come back to caves. We are too many.

Man is made or unmade by himself. By the right choice he ascends. As a being of power, intelligence, and love, and the lord of his own thoughts, he holds the key to every situation.

People are more difficult to work with than machines. And when you break a person, he can't be fixed.

The whole universe is contained within a single human being – you.

If you talk to a man in a language he understands, that goes to his head. If you talk to him in his language, that goes to his heart.

Humanity is acquiring all the right technology for all the wrong reasons.

Who makes us ignorant? We ourselves. We put our hands over our eyes and weep that it is dark.

If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals.

These are people who are capable of devotion, public devotion, to justice. They meant what they said and every day that passes, they mean it more.

That man is the noblest creature may also be inferred from the fact that no other creature has yet contested this claim.

Private passions tire and exhaust themselves, public ones never.