Dari Norman Vincent Peale

Believe in yourself! Have faith in your abilities! Without a humble but reasonable confidence in your own powers you cannot be successful or happy.

Change your thoughts and you change your world.

Do not be awe struck by other people and try to copy them. Nobody can be you as efficiently as you can.

Formulate and stamp indelibly on your mind a mental picture of yourself as succeeding. Hold this picture tenaciously. Never permit it to fade. Your mind will seek to develop the picture.