History repeats itself, first as tragedy, second as farce.

One day you will ask me which is more important? My life or yours? I will say mine and you will walk away not knowing that you are my life.

Every time I see an adult on a bicycle, I no longer despair for the future of the human race.

Life did not intend to make us perfect. Whoever is perfect belongs in a museum.

Your purpose in life is to find your purpose and give your whole heart and soul to it.

This terrifying world is not devoid of charms, of the mornings that make waking up worthwhile.

Speed and efficiency do not always increase the quality of life.

You are not stuck where you are unless you decide to be.

Every day brings a chance to live free of regret and with as much joy, fun, and laughter as you can stand.

We were all at once terribly alone; and alone we must see it through.

Sow a thought and you get an act; Sow an act and you get a habit; Sow a habit and you get a character; Sow a character and you get a destiny.

The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane.

The less you know, the more you believe.

Concision in style, precision in thought, decision in life.

Courage is a kind of salvation.

A man who dares to waste one hour of time has not discovered the value of life.

Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.

Old age is by nature rather talkative.

History is a set of lies agreed upon.

Science is the most reliable guide for civilization, for life, for success in the world. Searching a guide other than the science is meaning carelessness, ignorance and heresy.

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