We never knew an ignorant person yet but was prejudiced.

I don't believe there is anything in the whole earth that you can't learn in Berlin except the German language.

Whenever we come upon one of those intensely right words in a book or a newspaper the resulting effect is physical as well as spiritual, and electrically prompt.

It is our nature to conform; it is a force which not many can successfully resist. What is its seat? The inborn requirement of self-approval.

There is no character, howsoever good and fine, but it can be destroyed by ridicule, howsoever poor and witless. Observe the ass, for instance: his character is about perfect, he is the choicest spirit among all the humbler animals, yet see what ridicule has brought him to. Instead of feeling complimented when we are called an ass, we are left in doubt.

I wrote 'Tom Sawyer' and 'Huck Finn' for adults exclusively, and it always distressed me when I find that boys and girls have been allowed access to them. The mind that becomes soiled in youth can never again be washed clean.

The secret to success: find out where people are going and get there first