It is well known that when Thomas A. Eddison was stymied by a problem, he would lie down and take a short nap.

If you wait until circumstances justify your thinking pleasant thoughts, you are likely to wait forever.

Visualizing, creative mental picturing, is no more difficult than what you do when you remember some scene out of the past, or worry about the future. Acting out new action patterns is no more difficult than deciding, then following through on tying your shoes in a new and different manner each morning, instead of continuing to tie them in your old habitual way, without thought or decision.

As soon as the error has been recognized and corrections made, it's equally important that the error be forgotten and the successful attempt remembered and dwelt upon.

You can always find the sun within yourself if you will only search.

Skill in any performance whether it be in sports in playing the piano in conversation or in selling merchandise consists not in painfully and consciously thinking out each action as it is performed but in relaxing and letting the job do itself through you. Creative performance is spontaneous and ‘natural’ as opposed to self-conscious and studied.

Your most important sale in life is to sell yourself to yourself.