Science can only ascertain what is, but not what should be, and outside of its domain value judgements of all kinds remain necessary.
Heavier-than-air flying machines are impossible.
Biologists can be just as sensitive to heresy as theologians.
There is a principle which is a bar against all information, which cannot fail to keep a man in everlasting ignorance-that principle is contempt prior to investigation.
Those who are enslaved to their sects are not merely devoid of all sound knowledge, but they will not even stop to learn!
I can live with doubt and uncertainty and not knowing. I think it is much more interesting to live not knowing than to have answers that might be wrong. If we will only allow that, as we progress, we remain unsure, we will leave opportunities for alternatives. We will not become enthusiastic for the fact, the knowledge, the absolute truth of the day, but remain always uncertain … In order to make progress, one must leave the door to the unknown ajar.
Scientist alone is true poet he gives us the moon he promises the stars he'll make us a new universe if it comes to that.
Poetry creates life; Science dissects death.
Don't worry about people stealing your ideas. If your ideas are any good, you'll have to ram them down people's throats.
Inventor: A person who makes an ingenious arrangement of wheels, levers and springs, and believes it civilization.
Every sentence I utter must be understood not as an affirmation, but as a question.
Science in the modern world has many uses; its chief use, however, is to provide long words to cover the errors of the rich.
After all, science is essentially international, and it is only through lack of the historical sense that national qualities have been attributed to it.
Curiosity has its own reason for existence.
The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.
The universe is not required to be in perfect harmony with human ambition.
Chance favors the prepared mind.
The word God is for me nothing more than the expression and product of human weaknesses.
The gift of fantasy has meant more to me than my talent for absorbing positive knowledge.
To raise new questions, new possibilities, to regard old problems from a new angle, requires creative imagination and marks real advance in science.
We have guided missiles and misguided men.
The human mind likes a strange idea as little as the body likes a strange protein and resists it with a similar energy.
I find it quite improbable that such order came out of chaos. There has to be some organizing principle. God to me is a mystery, but is the explanation for the miracle of existence, why there is something instead of nothing.
Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.
Follow humbly wherever and to whatever abyss Nature leads, or you shall learn nothing.
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