Dr. Kardasz: I found these three great quotes at www.charactercounts.org 

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The older I get, the less I listen to what people say and the more I look at what they do.
-  Andrew Carnegie

By three methods we may learn wisdom: First, by reflection, which is noblest; second, by imitation, which is easiest; and third by experience, which is the bitterest.
- Confucius

The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.
- Friedrich Nietzsche