Inside myself is a place where I live all alone and that is where I renew my springs that never dry up.

When good people in any country cease their vigilance and struggle, then evil men prevail.

To know what one can have and to do with it, being prepared for no more, is the basis of equilibrium.

Let woman out of the home, let man into it, should be the aim of education. The home needs man, and the world outside needs woman.

I am always glad when any of my books can be put into an inexpensive edition, because I like to think that any people who might wish to read them can do so. Surely books ought to be within reach of everybody.

It is good to know our universe. What is new is only new to us.

In this unbelievable universe in which we live, there are no absolutes. Even parallel lines, reaching into infinity, meet somewhere yonder.