What a teacher needs to know about psychology "might almost be written on the palm of one's hand."

The greatest weapon against stress is our ability to choose one thought over another.

Millions of items in the outward order are present to my senses which never properly enter into my experience. Why? Because they have no interest for me. My experience is what I agree to attend to. Only those items which I notice shape my mind --without selective interest, experience is an utter chaos.

Our errors are surely not such awfully solemn things. In a world where we are so certain to incur them in spite of all our caution, a certain lightness of heart seems healthier than this excessive nervousness on their behalf.

Every individual existence goes out in a lonely spasm of helpless agony.

I don't sing because I'm happy; I'm happy because I sing.

[T]here is very little difference between one person and another, but what little difference ther eis, is very important.