How do you enter the realms of the spirit-world?

I discovered, when I entered these beautiful realms of the spirit-world, that it was not the influence of religious faith, which had brought me here, nor any adherence to ecclesiastical laws or commandments, but something much deeper, and sounder, and safer—

Indeed, the only safe thing—

Namely, the kind of life I had led while I was incarnate.

—Spirit Robert Hugh Benson