The beginning of the spiritual journey is the realization - not just the information, but the real interior conviction - that there is a higher power, or God. I would make it as easy as possible for everyone, that there is an Other - capital “O”.
Second step, is to try and become the Other - capital “O”.
And finally, the realization that there is no other.
You and the other are one. Always have been and always will be.
You just think that you aren’t and then, as the spiritual journey unfolds, one lets go of these false beliefs that there is separation from God.
It begins to perceive in events and in all other people the same presence of God, more and more aware of it, once found at the deepest level. And thus, the words of Paul become something which makes sense, that God is all in all - in other words, in a sense, we not only become God but are God.
–Father Thomas Keating