The economists will have to revise their theories of value.

I am absolutely convinced that no wealth in the world can help humanity forward, even in the hands of the most devoted worker in this cause. The example of great and pure characters is the only thing that can produce fine ideas and noble deeds. Money only appeals to selfishness and always tempts its owners irresistibly to abuse it

I was supposed to choose apractical profession, but this was simply unbearable to me.

It is my conviction that pure mathematical construction enables us to discover the concepts and the laws connecting them, which gives us the key to the understanding of nature ... In a certain sense, therefore, I hold it true that pure thought can grasp reality, as the ancients dreamed.

The time comes in life when we have read enough. It's time to stop reading. It's time to lay down the books and write.

So long as there are men, there will be wars.

I am content in my later years. I have kept my good humor and take neither myself nor the next person seriously.