It is very a dangerous thing to have an idea that you will not practice.

There is nothing final about a mistake, except its being taken as final.

There are two ways of meeting difficulties: you alter the difficulties or you alter yourself meeting them.

Luck enters into every contingency. You are a fool if you forget it – and a greater fool if you count upon it.

Neither saints nor angels have ever increased my faith in this enigma Life; but what are called ‘common men and women’ have increased it.

Death deceives relations often, and doctors sometimes, but the patient – never.

Personally, I think it’s a good way to let a child start right in with the laws of Nature before he’s old enough to be surprised at them.

Curiosity is the only thing that really carries through time, isn’t it? The creative curiosity, I mean, which fights its way into expression?

To be a Jew is to be strong with a strength that has outlived persecutions. It is to be wise against ignorance, honest against piracy, harmless against evil, kind against cruelty.

Every hen thinks she has laid the best egg! Can we not all believe as we choose? But the choice of others – what is that to us? Let them alone...