"Every act of conscious learning requires the willingness to suffer an injury to one's self-esteem. That is why young children, before they are aware of their own self-importance, learn so easily; and why older persons, especially if vain or important, cannot learn at all."

"Four questions that can tell you a lot:

1. When you wake up, do you expect today to have many joys or many frustrations?


2. When presented with an opportunity, do you have a bias toward action or do you postpone decisions?


3. When things go well for others, do you enjoy cheering them on or do you hate to hear about their success?


4. When things go wrong, do

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"Your teaching ability is constrained by your writing ability.

If you can’t write it down, it will be nearly impossible to teach it well."