Just as food eaten without appetite is a tedious nourishment, so does study without zeal damage the memory by not assimilating what it absorbs.

Whoever in discussion adduces authority uses not intellect but rather memory.

The noblest pleasure is the joy of understanding.

There are four powers: memory and intellect, desire and covetousness. The two first are mental and the others sensual. The three senses sight, hearing, and smell cannot well be prevented; touch and taste not at all.

Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.

Understanding is the heartwood of well-spoken words.