If we aren’t spending every moment of this life preparing for the next one, what is the point of our existence? Jesus is our Lord, and that means we give everything to Him. Every activity, every thought, every interaction, they are all for Him. Anything you do that isn’t for the glory of Christ is a rejection of His Lordship. If we confess Jesus as Lord with our lips but deny it with the way we live, then our confession isn’t genuine. You might be thinking, “It’s impossible to live that way”, and you’d be right.
Each one of us would be damned to Hell if not for the grace and mercy of Jesus Christ. That grace is His side of the equation. Our side is to accept that gift by acknowledging Him as our Lord. So, if at the core of your being, and with every ounce of your strength, you aren’t intent on pursuing every aspect of your life for His glory, then your surrender to Him as the Lord of your life cannot be genuine.