Hopeful Hume

I've been studying Hume, in very rudimentary terms, in my Philosophy of Science class. There is this beautiful assumption of empiricism - sensory experiences being the only true source of knowledge. Necessity is not discovered in experience - just because everytime a happens b happens.. it's not necessary, just causal. We BELIEVE that because the apple falls out of the tree everytime and hits the ground that EVERYTIME it leaves the tree it will hit the ground.. Because it's implausible that we ever experience anything in advance of it actually happening (save knowing with some certainty that Britney Spears will have another child) we cannot make the inductive generalization that the apple will ALWAYS fall. You can't have universal laws like gravity if they are based on the inductive reasoning that they will always happen in the future.
Isn't this just HOPEFUL? I think its so beautiful. Kids got it right. Keep jumping off the roof, again and again, because maybe THIS time, you could fly. Because you can never know for sure what will happen in the next moment. You can use induction to guess what will happen. But you can never know with certainty. I think it's so beautiful...