“What we observe is not nature itself, but nature exposed to our method of questioning.”

If the lecture is good, then everything is too smooth. That’s the same in music: if the performance is too good, you really don’t enjoy it, because it just goes by, and you can never penetrate into the heart of it.

If we made atomic bombs, we would bring about a terrible change in the world. Who knows what would happen from this?

If this were the whole truth, we should, when entering into a new field, introduce only such quantities as can directly be observed, and formulate natural laws only by means of these quantities.

It is generally believed that our science is empirical and that we draw our concepts and our mathematical constructs from the empirical data.

Reports in Washington show that our reasoning was just like that of your physicists.

In America, it was decided to attempt the production of atomic bombs with an effort that would constitute a large part of the collective American war effort.

The solution of the difficulty is that the two mental pictures which experiment lead us to form – the one of the particles, the other of the waves – are both incomplete and have only the validity of analogies which are accurate only in limiting cases.

The problems of language here are really serious. We wish to speak in some way about the structure of the atoms. But we cannot speak about atoms in ordinary language.

I think that if a United States of Europe were to be formed, it would be in our interests to fight for it, as all our old traditions would remain in such a united Europe, whereas if we were to start now as part of the Russian Empire, everything that had ever been in Germany would disappear.

Bohr’s influence on the physics and the physicists of our century was stronger than that of anyone else, even than that of Albert Einstein.

The single life is bearable to me only through my work in science, but for the long term, it would be very bad if I had to make do without a very young person next to me.

Whoever dedicates his life to searching out particular connections of nature will spontaneously be confronted with the question how they harmoniously fit into the whole.

With all this information available, at least to privileged persons, I cannot understand why it is generally held in the United States that we completely missed the basic principle of the bomb until after Hiroshima.

In 1924, I became a Dozent in Gottingen and worked out the quantum mechanics during a holiday stay on Heligoland.

The uncertainty relation does not refer to the past; if the velocity of the electron is at first known and the position then exactly measured, the position for times previous to the measurement may be calculated.

There is a great difference between discoveries and inventions. With discoveries, one can always be skeptical, and many surprises can take place. In the case of inventions, surprises can really only occur for people who have not had anything to do with it.

We are slaves, deprived of every right, exposed to every insult, condemned to certain death, but we still possess one power, and we must defend it with all our strength for it is the last – the power to refuse our consent.

When nonviolence begins halfway through the war with the aggressor calling time out, it exposes itself as a ruse.

I collect art, and I drink wine… things that I like that I had never been exposed to. But I never said, ‘I’m going to buy art to impress this crowd.’ That’s just ridiculous to me. I don’t live my life like that, because how could you be happy with yourself?

Prejudgments become prejudices only if they are reversible when exposed to new knowledge.

Prejudgments become prejudices only if they are not reversible when exposed to new knowledge.

I can’t expose a human weakness on the stage unless I know it through having it myself.

The methods it employs with such acumen, persistency, and secrecy are employed by all sorts of business men, from corner grocers up to bankers. If exposed, they are excused on the ground that this is business.

Expose yourself to aloneness.