Confessing the lordship of Jesus Christ, in one's life, is essential to his/her salvation. However, such a confession must be more than just a verbal declaration. It must be a heart’s position.
There is an old saying that actions speak louder than words. This rings true in our relationship with God. The things we do, more accurately attest to what we believe. And it testifies of where our heart is positioned.
Jesus was not so much interested in what people said of him. He was more concerned with what was in their hearts. He knew that many would have honoured Him with their lips, but their hearts were far from Him. In this regard He quoted the Prophet Isaiah (Matt. 15:8). Evidence of the disparity between the people’s “heart’s position” and their “lip-service” was their vain worship and man-made doctrines. They preferred to obey the customs of man, rather than the commandments of God, Jesus further testified against many of His “followers” who would call Him “Lord, Lord” but not DO as he said (Lk. 6:46).
Additionally, in Matthew 7:21 Jesus hammers home the point by saying, “Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who DOES the will of my Father”. Obeying God’s Word and doing His will testifies of our surrender to the lordship of Christ. According to the Apostle James, when we don't DO (obey) what we have heard (God’s Word), we deceive ourselves.
Let us, therefore, genuinely follow the teachings of Christ, honestly DO as He has said and teach others to observe all thing that He has commanded us to Do. To obey is better than sacrifice.