answer:There’s no way of thinking about an origin or causation of the Big Bang. It’s tempting to imagine the single point of “something” hanging out in the middle of “nothing” before the Big Bang, waiting for some cause to trigger it like a match to the fuse. For the Big Bang to have a cause, or for it to have “come from” anything at all, would be impossible because there was no “before” the Big Bang, and any definition of causation would have to assume a “before”. This robs us of the basic building blocks by which we think of “existence”. Take away time and space, both of which originated in the Big Bang, and any concept of causation falls apart. So the unsatisfying answer to the question is that the question can’t be asked in the language of the Big Bang.