Sameness leaves us in peace but it is contradiction that makes us productive.

One says a lot in vain, refusing; The other mainly hears the "No."

We talk too much. We should talk less and draw more.

Let us seek to fathom those things that are fathomable and reserve those things which are unfathomable for reverence in quietude.

People are so constituted that everybody would rather undertake what they see others do, whether they have an aptitude for it or not.

Science and art belong to the whole world, and before them vanish the barriers of nationality.

The dear good people don't know how long it takes to learn to read. I've been at it eighty years, and can't say yet that I've reached the goal.