+3
A few from the supremely quotable Samuel Clemens:
"Action speaks louder than words but not nearly as often."
"It is better to keep your mouth shut and appear stupid than to open it and remove all doubt."
"Education is the path from cocky ignorance to miserable uncertainty."
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Scarecrow: I haven't got a brain ... only straw. Dorothy: How can you talk if you haven't got a brain? Scarecrow: I don't know. But some people without brains do an awful lot of talking, don't they? Dorothy: Yes, I guess you're right.