Hume

In this section Hume asked what made man kind acknowledge words and have propensity in all ages to profess the contrary opinion?
Hume thinks that it is the production of effects from the causes. He said that our fatalities can never carry us farther in knowledge of this relation, that particular objects are constantly conjoined together.
I though I feel that this is true that we cant carry things in knowledge farther then we know, and particular objects are also conjoined together and that effects and cause will always be in the same place. I cant help but wonder why this would be why must a effect always have a cause? Why must everything go together? I know no the answer I can only think that it is because all things go with each other.