The only source of knowledge is experience.
Albert Einstein

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.
Albert Einstein

Everything human is pathetic. The secret source of humor itself is not joy but sorrow. There is no humor in heaven.
Mark Twain

The secret source of humor is not joy but sorrow; there is no humor in Heaven.
Mark Twain

Your most unhappy customers are your greatest source of learning.
Bill Gates

Globalization has changed us into a company that searches the world, not just to sell or to source, but to find intellectual capital - the world's best talents and greatest ideas.
Jack Welch

For years my wedding ring has done its job. It has led me not into temptation. It has reminded my husband numerous times at parties that it's time to go home. It has been a source of relief to a dinner companion. It has been a status symbol in the maternity ward.
Erma Bombeck

Silence is a source of great strength.
Lao Tzu

Love never dies a natural death. It dies because we don't know how to replenish it's source. It dies of blindness and errors and betrayals. It dies of illness and wounds; it dies of weariness, of witherings, of tarnishings.
Anais Nin

The act of birth is the first experience of anxiety, and thus the source and prototype of the affect of anxiety.
Sigmund Freud

There is no possible source of evil except good.
Saint Augustine

Love is life. All, everything that I understand, I understand only because I love. Everything is, everything exists, only because I love. Everything is united by it alone. Love is God, and to die means that I, a particle of love, shall return to the general and eternal source.
Leo Tolstoy

No stream rises higher than its source. What ever man might build could never express or reflect more than he was. He could record neither more nor less than he had learned of life when the buildings were built.
Frank Lloyd Wright

Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power.
P. J. O'Rourke

Concupiscence and force are the source of all our actions; concupiscence causes voluntary actions, force involuntary ones.
Blaise Pascal

A major source of objection to a free economy is precisely that group thinks they ought to want. Underlying most arguments against the free market is a lack of belief in freedom itself.
Milton Friedman

A man who as a physical being is always turned toward the outside, thinking that his happiness lies outside him, finally turns inward and discovers that the source is within him.
Soren Kierkegaard

On September 11 2001, America felt its vulnerability even to threats that gather on the other side of the Earth. We resolved then, and we are resolved today, to confront every threat from any source that could bring sudden terror and suffering to America.
George W. Bush

A particularly beautiful woman is a source of terror. As a rule, a beautiful woman is a terrible disappointment.
Carl Jung

The tendency to claim God as an ally for our partisan value and ends is the source of all religious fanaticism.
Reinhold Niebuhr