Those who, in debate, appeal to their qualifications, argue from memory, not from understanding.

Leonardo da Vinci

Debate Appeal Qualifications Memory...+2

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

Leonardo da Vinci

Argument Authority Intelligence Memory

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

Leonardo da Vinci

Discussion Authority Intellect Memory

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

Leonardo da Vinci

Food Appetite Nourishment Study...+3

The noblest pleasure is the joy of understanding.

Leonardo da Vinci

Noblest Pleasure Joy 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.

Leonardo da Vinci

Powers Memory Intellect Desire...+7

I certainly think we need a common understanding in order to be able to work together productively. And there are certain forces that work against us.