Reality begins with you.
Consciousness creates time and space.
The expansion of the Universe relates to the expansion of consciousness. Belief, informed by experience. Everybody believes what their world has taught them. Our experiences, shared and agreed.
Yet no two beliefs can ever be exactly the same. We have - within the bounds of reason - control over the shape of our own reality and existence.
Religious sects and secret societies, trying to find a way to control belief to minimise conflict within humanity, have known this for millennia. In the beginning, with humanity at its most animalistic and brutal, these sects and societies were in almost complete agreement that the way to control experience and belief was through fear.
Its results were instant.