The Corpus Hermeticum 

It chanced once on a time my mind was meditating on the things that are, my thought was raised to a great height, the senses of my body being held back - just as men who are weighed down with sleep after a fill of food, or from fatigue of body.
Methought a Being more than vast, in size beyond all bounds, called out my name and saith: What wouldst thou hear and see, and what hast thou in mind to learn and know?