The great enemy of clear language is insincerity. When there is a gap between one's real and one's declared aims, one turns as if it were instinctively to long words and exhausted idioms, like a cuttlefish squirting out ink.
Man is the only creature that consumes without producing. He does not give milk, he does not lay eggs, he is too weak to pull the plough, he cannot run fast enough to catch rabbits. Yet he is lord of all the animals. He sets them to work, he gives back to them the bare minimum that will prevent them from starving, and the rest he keeps for himself.