Q&A: Why study the Bible if God writes his word on our hearts?

Mike interprets 'word on our hearts' as referring to God's commands and desires being internalized — not to memorizing the full biblical text. He then turns the argument: the only way to fulfill the verse literally (not needing the Bible because it is written on your heart) is to have the entire Bible memorized, which would mean you carry it with you. Additionally, the human capacity for self-deception, the pull of the flesh, and the influence of the world mean that the written Word serves as an external corrective — a 'sword' (Hebrews 4:12) that discerns the thoughts and intentions of the heart. The indwelling Spirit and the written Word are complementary, not competing.