A human being is a deciding being.

Progress of mankind is progress of mind and intellect.

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

Take away paradox from the thinker and you have a professor.

The first human who hurled an insult instead of a stone was the founder of civilization.

The greatest sweetener of human life is Friendship. To raise this to the highest pitch of enjoyment, is a secret which but few discover.

People seldom do what they believe in. They do what is convenient, then repent.

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

Humanism was not wrong in thinking that truth, beauty, liberty, and equality are of infinite value, but in thinking that man can get them for himself without grace.

Of mankind we may say in general they are fickle, hypocritical, and greedy of gain.

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.

If you can't say something good about someone, sit right here by me.

Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.

The true measure of a man is how he treats someone who can do him absolutely no good.

I just invent, then wait until man comes around to needing what I've invented.

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

A person is a person because he recognizes others as persons.

A person's a person, no matter how small.

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

How important it is for us to recognize and celebrate our heroes and she-roes!

Humans are not proud of their ancestors, and rarely invite them round to dinner.