It is dangerous to be sincere unless you are also stupid.

Now that we have learned to fly the air like birds, swim under water like fish, we lack one thing - to learn to live on earth as human beings.

The people who get on in this world are the people who get up and look for the circumstances they want and if they can't find them, make them.

I am very sorry, but I cannot learn languages. I have tried hard, only to find that men of ordinary capacity can learn Sanskrit in less time that it takes me to buy a German Dictionary

I do not waste my time writing pot-boilers: the pot must be boiled, and even my pot au feu has some chunks of fresh meat in it. ...I have no time to boil myself down; and anyhow I could not do so and preserve all the necessary nutriment and the flavoring on which the digestibility depends.

Science becomes dangerous only when it imagines that it has reached its goal.

We all have--to put it as nicely as I can--our lower centres and our higher centres. Our lower centres act: they act with terriblepower that sometimes destroys us; but they don't talk.... Since the war the lower centres have become vocal. And the effect is that of an earthquake. For they speak truths that have never been spoken before--truths that the makers of our domestic institutions have tried to ignore.