God is the Great Mystagogue. That is inevitable because God is the Primal Mystery. Therefore the Basic Mystagogy is God's Self -revelation in time. And, when moved by God's "inciting and quickening Spirit," we worship, we exert a Personal Mystagogy.
Hoyer, George W., "Worship as Mystagogy" (1988). Institute of Liturgical Studies Occasional Papers. Paper 39.