The central message of this sermon is that commitment to God is not based on human effort or motivation, but rather it is a response to what God has already done for us. It is only in recognition of God's mercy, love, and initiative that we can make a genuine commitment to Him. The speaker emphasizes that our ability to commit ourselves to God is a fundamental aspect of personhood, implying volition, responsibility, and authority. This understanding challenges the idea that commitment is solely a human endeavor, and instead highlights the importance of acknowledging and responding to God's prior initiative in our lives. The takeaway from this sermon is that true commitment to God is not something we can muster up on our own, but rather it arises from recognizing and appreciating what He has already done for us.