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Hang on to your youthful enthusiasms — you'll be able to use them better when you're older.
Letters 76
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A gem cannot be polished without friction, nor a man perfected without trials.
Attributed
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No man is free who is a slave to the body.
Letters 92.33
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The bravest sight in the world is to see a great man struggling against adversity.
On Providence 2.9
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Fire tests gold, suffering tests brave men.
On Providence 5.10
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Disaster is virtue's opportunity.
On Providence 4.6
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A sword never kills anybody; it is a tool in the killer's hand.
Letters 87
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There is no genius without a touch of madness.
On Tranquility 17.10
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Letters 2
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Wherever there is a human being, there is an opportunity for kindness.
On the Happy Life 24