 Hume argues that the connection can’t involve relations of ideas. Effects are different events from their causes, so there is no contradiction in conceiving of a cause occurring, and its usual effect not occurring. Ordinary causal judgments are so familiar that we tend to overlook this; they seem immediate and intuitive. But suppose you were suddenly brought into the world as an adult, armed with the intellectual firepower of an Einstein. Could you, simply by examining an aspirin tablet, determine that it will relieve your headache?