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To speak is to risk, but to be silent is to risk more.
To say something is to perform an action, and to perform an action is to do something with words.
The worst sin toward our fellow creatures is not to hate them, but to be indifferent to them: that's the essence of inhumanity.
Abstraction is the key to mathematics.
If you really want to succeed, don't be afraid of failure.
The only disability in life is a bad attitude.