"If you want more you have to do more. And as you do more it's uncomfortable."
This is moving out of the "comfort zone."
-Jack Canfield on self esteem
Canfield has a lot of material on self esteem and motivational strategies, and much of his research and material is on moving out of your comfort zone. He has practical information that you can apply to your life if you read or listen to his materials. He's definitely a "keeper"!