Steve, thanks for the link to a part of the AOY which I reread with utmost interest.
The words of SY constitute an ideal model on which we can base our elaborations of reality. They are exceedingly valuable.
His causal medium finds expression when man is thinking or diving deep in introspection or meditation; the cosmical thoughts of genius come to the man who habitually contacts his causal body.
The above sentence may clarify Anandamoy's concept of God's vast spheres of thought. The ideas God used in creation are residing in the causal world and people may attune to them (strong introspective abilities, geniuses), or they may attune to a distortion of them and believe they are a truth themselves (weak introspective abilities, influenced by one's ego and other circulating wrong ideas or distortions of true ideas of God residing in the causal cosmos, the blueprint of the physical -and astral- worlds).