It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.

I hear and I forget. I see and I remember. I do and I understand.

We make a living by what we get, but we make a life by what we give.

Nobody cares how much you know, until they know how much you care.

It's not that I'm so smart, it's just that I stay with problems longer.

Insanity: doing the same thing over and over again and expecting different results.

If you don't know where you are going, you might wind up someplace else.

Progress lies not in enhancing what is, but in advancing toward what will be.

To be is to do.

Quality is never an accident. It is always the result of intelligent effort.

A gem cannot be polished without friction, nor a man perfected without trials.

Life is but thought.

In the kingdom of the blind, the one-eyed man is king.

There are things known and there are things unknown, and in between are the doors of perception.

Fortune favors the prepared mind.

People are not disturbed by things, but by the view they take of them.

In matters of style, swim with the current; in matters of principle, stand like a rock.

There are three classes of people: those who see, those who see when they are shown, those who do not see.

None so deaf as those that will not hear. None so blind as those that will not see.

Do not let what you cannot do interfere with what you can do.

The precision of naming takes away from the uniqueness of seeing.

Mystery creates wonder and wonder is the basis of man's desire to understand.

Well begun is half done.

Judge a man by his questions rather than his answers.

We cannot teach people anything; we can only help them discover it within themselves.

We have all the light we need, we just need to put it in practice.

The time is always right to do what is right.

It is the set of the sails, not the direction of the wind that determines which way we will go.

Do not seek to follow in the footsteps of the wise. Seek what they sought.

Be less curious about people and more curious about ideas.

Yesterday's home runs don't win today's games.

To every action there is always opposed an equal reaction.

We can learn something new anytime we believe we can.

We don't see things as they are, we see them as we are.

Be nice to people on your way up because you'll meet them on your way down.

If not me, who? And if not now, when?

After all is said and done, more is said than done.

If youth knew; if age could.

You're either part of the solution or you're part of the problem.

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

Simplicity is the ultimate sophistication.

If you do what you've always done, you'll get what you've always gotten.

It is not enough to have a good mind; the main thing is to use it well.

What worries you, masters you.

We are what we believe we are.

Everything that is beautiful and noble is the product of reason and calculation.

You cannot push any one up a ladder unless he be willing to climb a little himself.

Idealism increases in direct proportion to one's distance from the problem.

God gives the nuts, but he does not crack them.

Never mistake motion for action.

Nothing exists except atoms and empty space; everything else is opinion.

There is nothing more uncommon than common sense.

The real meaning of enlightenment is to gaze with undimmed eyes on all darkness.

Your goals, minus your doubts, equal your reality.

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.

Really, the only thing that makes sense is to strive for greater collective enlightenment.

What we plant in the soil of contemplation, we shall reap in the harvest of action.

You exist only in what you do.

The final forming of a person's character lies in their own hands.

There are three musts that hold us back: I must do well. You must treat me well. And the world must be easy.