"The first indication of a young person's growing smarter is that he no longer understands the things which he used to consider quite intelligible and self-evident."

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Learning is not to be tacked to the mind, but we must fuse and blend them together, not merely giving the mind a slight tincture, but a thorough and perfect dye. And if we perceive no evident change and improvement, it would be better to leave it alone; learning is a dangerous weapon, and apt to wound its master if it be wielded by a feeble hand, and by one not well acquainted with its use.

— Michel de Montaigne