The fool doth think he is wise, but the wise man knows himself to be a fool.
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William Shakespeare
The secret of life, though, is to fall seven times and to get up eight times.
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Paulo Coelho
It is the mark of an educated mind to be able to entertain a thought without accepting it.
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Aristotle
The simple things are also the most extraordinary things, and only the wise can see them.
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Paulo Coelho
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.
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Confucius