Yes, all possibilities exist. Now, is everything we think of possible right this moment? No, not at all. With time, it is obviously very possible. Think of it in this way, 3,000 years ago, if you lived back then, going to the moon was totally out of the question! Just imagine it. The point is that no matter what we think of, it will be possible at some point in time. It may be right after you die or it may be hundreds or thousands of years after you die. If some possibilities we think of are actually not possible, then, why do humans exist? Humans are here to explore. "If you tell a man not to go over the mountain no matter what, he will go over that mountain!" It is our urge to explore and discover - that alone can lead you to the conclusion that everything is possible.