Marsilio Ficino was an astrologer and mystic - one of the precious few produced in the western sphere. It therefore seems somewhat strange that Thomas More seems so deeply uncomfortable with this singular fact and, at every turn, attempts some alchemy of his own in an attempt to cram all of Ficino's depth into the little box of analytical psychology (which remains an admirable field, nonetheless). Psychological insight can be of incalculable value in making mystical and esoteric treatises of the past more comprehensible to the modern reader but these are things which speak to man's heart and guts and soul... not just his psyche and I assert that by contorting Ficino into the proto-psychologist of the renaissance you end up disavowing the greater part of his genius - a tragedy. If you are uncomfortable with the reality of astrology, Mr More, I suggest you leave the astrologers in peace.
It is nothing short of miraculous to "discover" that the last frontier is not outer space after all, but Inner Space ("the things which are seen are but a mirror of the things not seen")...if you are questing for this reality, you might find it helpful to read St. Teresa's book THE INTERIOR CASTLE.