To argue with a person who has renounced the use of reason is like administering medicine to the dead.

A learned blockhead is a greater blockhead than an ignorant one.

People all over the nation are starved for honesty and common sense.

Every high civilization decays by forgetting obvious things.

Science is a first-rate piece of furniture for a man's upper chamber, if he has common sense on the ground floor.

Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense.

Let thy speech be short, comprehending much in few words

Look at the stars and not down at your own feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious.

Talk of mysteries! Think of our life in nature—daily to be shown matter, to come in contact with it—rocks, trees, wind on our cheeks! The solid earth! The actual world! The common sense! Contact! Contact! Who are we? Where are we?

The oldest, shortest words - “yes” and “no” - are those which require the most thought.

To fly as fast as thought, you must begin by knowing that you have already arrived.

I like thinking big. If you’re going to be thinking anything, you might as well think big.

Ideas are like rabbits. You get a couple and learn how to handle them, and pretty soon you have a dozen.

Think lovingly, speak lovingly, act lovingly, and every need shall be supplied.

It doesn't matter how smart you are unless you stop and think.

Much of the evil in the world is due to the fact that man in general is hopelessly unconscious.

The past is memory. The future is imagination. All that exists is now.

He who fears he shall suffer, already suffers what he fears.

A man is as big as the measure of his thinking.