The Interior Castle

Continuing through the Sixth Mansions, Teresa uses the metaphor of spiritual betrothal to describe a deeper level of prayer where the soul experiences profound union with God, like a couple getting engaged after courtship. This isn't the final spiritual marriage yet, but a serious commitment phase where both parties know they're meant for each other. However, Teresa warns that this is precisely when the devil works hardest to derail spiritual progress. Like a jealous rival trying to break up an engagement, Satan uses subtle deceptions to lead souls astray through seemingly small compromises that gradually weaken their resolve. Teresa explains that people at this spiritual level are particularly dangerous to evil because one spiritually mature person can influence countless others toward good - think of how saints like Francis or Dominic changed history. She addresses two key questions: how can a soul united with God's will be deceived, and how can the devil reach someone living a religious life? Her answers reveal that no external circumstances guarantee safety; even Judas walked with Jesus. The key is constant self-examination, checking whether we're actually growing in love for others and humility, not just having spiritual experiences. God doesn't abandon souls who reach this mansion, but gives them secret warnings when they're drifting. The chapter emphasizes that spiritual progress should be continuous - if we're standing still, something's wrong, because genuine love never stops growing.