Now if you see that it is inconceivable that anything should exist, it is evident that at least one inconceivable fact is there. That is to say, that which exists is not limited to the conceivable. Since the inconceivable is there, it is impossible to set any limit to the quantity of inconceivableness which may be present in the situation. Now were the existence of anything consistently to remind you of the fact of inconceivability, since it is impossible to live without interacting with a large number of existing things, it would be impossible for you to feel in the same way about the conceivable.
Advice to Clever Children (1981)