"A wise man gets more use from his enemies than a fool from his friends" — Baltasar Gracian y Morales

Not to unlearn what you have learned is the most necessary kind of learning.

Be wise with speed; a fool at forty is a fool indeed

Who knows, the mind has the key to all things besides

One must be a wise reader to quote wisely and well

The investigation of the meaning of words is the beginning of education

The wrath of the lion is the wisdom of God

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