Hume's Attack on Enlightenment

Hume's chief service in the attack on enlightenment consisted in doubting whether two propositions one, whether the causal relationship was something which we directly perceived or indeed knew to exist at all. He said that so far from things being necessitated by other things, they just followed long in a regular manner, without being necessitated. The second proposition, more important for our purposes, is that when he asked himself how he knew that there was an external world at all, he said he couldn't deduce it logically. There was no way of demonstrating that tables existed. All i can say is that if i ignore it, i shall rue it. Belief is not the same as deductive certainty