Your parents didn’t raise you to hear sermons from you; you are cheating them. The woman didn’t marry you to hear sermons from you; it is a thing of cheating. If you marry someone, and then tell her to become a nun, you say, "I am a monk, you become a nun," she’ll say, "Why didn’t you disclose this at the right time?" So there is a breach of trust involved here.
Pay the price: in cash, in kind.
If you really want to proceed with what you are doing, compensate!