Don't be too timid and squeamish about your actions. All life is an experiment. The more experiments you make the better.
Science is the outcome of being prepared to live without certainty and therefore a mark of maturity. It embraces doubt and loose ends.
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.
Life is too short, or too long, for me to allow myself the luxury of living it so badly.
The more sand that has escaped from the hourglass of our life, the clearer we should see through it.
All my life I used to wonder what I would become when I grew up. Then, about seven years ago, I realized that I was never going to grow up - that growing is an ever ongoing process.
To do a great right do a little wrong.
We think too much and feel too little.
Exceptional claims demand exceptional evidence.
The image is one thing and the human being is another...It's very hard to live up to an image, put it that way.
Three things have been difficult to tame: the oceans, fools, and women. We may soon be able to tame the oceans; fools and women will take a little longer.
Where there is love there is life.
Take a chance! All life is a chance. The man who goes farthest is generally the one who is willing to do and dare.
Wrinkles should merely indicate where the smiles have been.
The happiest is the person who suffers the least pain; the most miserable who enjoys the least pleasure.
Work harder on yourself than you do on your job.
If we are not free, no one will respect us.
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.
A man who dares to waste one hour of life has not discovered the value of life
Anyone who lives within their means suffers from a lack of imagination.
You can find the entire cosmos lurking in its least remarkable objects.