Never forget that all the enthusiasm you need is in your mind. Let it out - let it live - let it motivate you.

The more you lose yourself in something bigger than yourself, the more energy you will have.

Promises are like crying babies in a theater, they should be carried out at once.

Enthusiasm releases the drive to carry you over obstacles and adds significance to all that you do. It tones up your physical vitality and gives warmth to all your personal relationships. When you associate with enthusiasm long enough it grabs you and takes over within you.

Masterly retreat is in itself a victory.

Don't duck the most difficult problems. That just ensures that the hardest part will be left when you are most tired. Get the big one done - it's downhill from then on.

Never use the word “impossible” seriously again. Toss it into the verbal wastebucket.