Deuteronomy 11:16 Take heed to yourselves, that your heart be not deceived, and ye turn aside, and serve other gods, and worship them.
Our response to God’s grace and salvation is to take heed to yourselves to make certain that you remain faithful to the One True God, the only God, the one who loves you and saves you. Pay attention to your own heart to know that you are still in the faith. Your soul (mind, will, and emotions) can be deceived. We can too easily think false thoughts, make bad decisions, and let negative emotions control us. We need to believe God who says that I, even I, can be deceived.
We do not respond by being so proud and presumptuous as to think we don’t need God, thereby turning aside and making SELF a god. Self is the most common idol god that sinners serve, and the most deceptive. Therefore, we take heed to ourselves, for we can be so easily deceived that we don’t even know we are making self a god. Thus Paul writes in 1 Corinthians 11:28, “Let a person examine himself, then, and so eat of the bread and drink of the cup.” We repent and believe in preparation for receiving the Lord’s Supper. We also confess sin and confess Jesus daily; we confess that we are sinners in need of salvation and we confess that Jesus is our Salvation and our Lord. This is taking heed.