All that is needed is a certain emptiness in you. So the emptiness is good; don’t fill it by beliefs, don’t fill it again by another kind of god, another philosophy, some existentialism. Don’t fill it. Leave it clean and fresh, and go deeper.
Soon you will find from both sides, from outside and inside, a tremendous rush of energy, a tremendous rush of consciousness. Then you disappear, you are almost flooded with the cosmos. You are so small and the cosmos is so vast. You suddenly disappear into it, and that disappearance is the ultimate experience of enlightenment. Then you know you were neither an outsider, nor an insider; you are one with existence.
Other than oneness with existence, nothing is going to help you. But that oneness is so easy, so obvious. Just a little relaxation, just a little turning in.