This particular passage from the Treatise on True Devotion continues to resonate for me, years after I first underlined it:
Mary is the sealed fountain and the faithful spouse of the Holy Spirit where only he may enter. She is the sanctuary and resting-place of the Blessed Trinity where God dwells in greater and more divine splendour than anywhere else in the universe, not excluding his dwelling above the cherubim and seraphim. No creature, however pure, may enter there without being specially privileged.Saint Louis Marie de Montfort, Treatise on True Devotion to the Blessed Virgin
This language and further paragraphs which I will copy later remind me of some images of Creation or the Garden of Eden. And the imagery of the sacred womb as hidden Divine world is likewise intimate and touching. I remembered seeing the priest open the tabernacle below a baroque high altar with Our Lady atop, and in that moment being reminded of the birth of Our Lord. The architecture in that church did indeed seem to point to the idea of a sanctuary and resting-place for Our Lord.