Paracelsus lived a few centuries before the really nasty stuff had been discovered. For example Plutonium. 1/50th of a Plutonium atom could maybe be a remedy.
True. But it doesn't really make his statement wrong. Theoretically it's always a question of the amount. We even eat quicksilver whenever we eat fish. Especially tuna fish. But if we don't eat it too often, we won't become ill.
