As for one who is choosy about what he learns, we shall not call him a lover of learning or a philosopher, just as we shall not say that a man who is difficult about his food is hungry or has an appetite for food.
We shall call him a lover of food but a poor eater...
But we shall call a philosopher the man who is easily willing to learn every kind of knowledge, gladly turns to learning things, and is insatiable in this respect.
What are the connections here between the eating and the thinking?