All true things must change and only that which changes remains true.

Mistakes are, after all, the foundations of truth, and if a man does not know what a thing is, it is at least an increase in knowledge if he knows what it is not.

People will do anything, no matter how absurd, to avoid facing their own souls.

Projection [of our own shadow] makes the whole world a replica of our own unknown face.

Our whole educational problem suffers from a one-sided approach to the child who is to be educated, and from an equally one-sided lack of emphasis on the uneducatedness of the educator.

We all must do what Christ did. We must make our experiment. We must make mistakes. We must live out our own version of life. And there will be error. If you avoid error you do not live.

I am the triple owner of the world, the finest Turkey, the Lorelei, Germania and Helvetia of exclusively sweet butter and Naples, and I must supply the whole world with macaroni.