Every addition to true knowledge is an addition to human power.

Success is the sum of small efforts - repeated day in and day out.

When ambition ends, happiness begins.

If we open a quarrel between past and present, we shall find that we have lost the future.

Hope is patience with the lamp lit.

A single sunbeam is enough to drive away many shadows.

Forgiveness is the key to action and freedom.

All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

All the knowledge I possess everyone else can acquire, but my heart is all my own.

Knowledge is like money: to be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value.

I never think of the future - it comes soon enough.

Laughter is the closest distance between two people.

Even the knowledge of my own fallibility cannot keep me from making mistakes. Only when I fall do I get up again.

Consistency is the last refuge of the unimaginative.

We are drowning in information but starved for knowledge.

Real knowledge is to know the extent of one's ignorance.

Better keep yourself clean and bright; you are the window through which you must see the world.

Life consists not in holding good cards but in playing those you hold well.

It is harder to conceal ignorance than to acquire knowledge.

Humility and knowledge in poor clothes excel pride and ignorance in costly attire.

Having knowledge but lacking the power to express it clearly is no better than never having any ideas at all.

Knowledge has to be improved, challenged, and increased constantly, or it vanishes.

The true sign of intelligence is not knowledge but imagination.

Opinion is the medium between knowledge and ignorance.

A man of knowledge lives by acting, not by thinking about acting.

Every addition to true knowledge is an addition to human power.

Freedom means the opportunity to be what we never thought we would be.

The best advice I ever got was that knowledge is power and to keep reading.

The best way to cheer yourself up is to try to cheer somebody else up.

Knowledge is love and light and vision.

We aim above the mark to hit the mark.

Knowledge rests not upon truth alone, but upon error also.

Education is the movement from darkness to light.

Knowledge is the eye of desire and can become the pilot of the soul.

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

There are two ways of spreading light: to be the candle or the mirror that reflects it.

Knowledge is only one-half. Faith is the other.

Even the knowledge of my own fallibility cannot keep me from making mistakes. Only when I fall do I get up again.

There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.

I don't pretend we have all the answers. But the questions are certainly worth thinking about.

A man of knowledge lives by acting, not by thinking about acting.

Formula for success: rise early, work hard, strike oil.

I have never in my life learned anything from any man who agreed with me.

Cherish that which is within you, and shut off that which is without; for much knowledge is a curse.

It is one of my sources of happiness never to desire a knowledge of other people's business.

But inner experience is only one source of human knowledge.

Every addition to true knowledge is an addition to human power.

There are no shortcuts in evolution.

Knowledge is like money: to be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value.

Opinion is the medium between knowledge and ignorance.