The most important things are the hardest things to say. They are the things you get ashamed of because words diminish your feelings - words shrink things that seem timeless when they are in your head to no more than living size when they are brought out.

It is a cursed evil to any man to become as absorbed in any subject as I am in mine.

Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.

I am turned into a sort of machine for observing facts and grinding out conclusions.

False facts are highly injurious to the progress of science, for they often endure long; but false views, if supported by some evidence, do little harm, for every one takes a salutary pleasure in proving their falseness.

Once you can accept the universe as matter expanding into nothing that is something, wearing stripes with plaid comes easy.

The important thing is not to stop questioning.

Intellectuals solve problems; geniuses prevent them.

Only two things are infinite, the universe and human stupidity and I'm not sure about the former.

The difference between genius and stupidity is that genius has its limits.