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

You can do only one thing at a time. I simply tackle one problem and concentrate all efforts on what I am doing at the moment.

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.

We simply must get it through our heads that holding a low opinion of ourselves is not a virtue, but a vice.

Close scrutiny will show that most of these everyday socalled “crisis situations” are not life-or-death matters at all, but opportunities to either advance, or stay where you are.

True success and true happiness not only go together but each other enhances the other.

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