Teresa imagines the soul as a crystal castle with many dwellings, at the center of which God resides. She maps the contemplative journey as a movement through these dwellings — not a literal ascent but a deepening, in which prayer becomes less one’s own activity and more a participation in divine life.
The book is unusually practical. Teresa is skeptical of flashy spiritual experiences and keeps returning to the fruits: humility, growing love for others, readiness to serve. Union, in her account, is not about escape but about becoming capable of love.