Christ’s confession before the Father secures our eternal life, for the Father cannot deny the Son. If the Son makes a request on our behalf, then the Father must comply with that.
Here is a test that divides the elect from the reprobate: are they willing to confess Christ before a lost world? The attitude of men towards Jesus Christ is the dividing line that separates God’s people from those who do not know him. How can any who truly know Christ be ashamed of him, when he has life in him, and in him are hid all the treasures of wisdom and knowledge?
We should not connect our confessing Christ before men, and his confessing us before the Father, as if the one earns the other. The difference between them is so great that our confession could never be a payment for his confession. It is all of grace, and we can never deserve his loyalty to us. In this sense, this is more of an assurance than a promise; it assures us that if we confess him, he will not fail to do the greater thing for us and confess us before the Father. And yet it is a promise, for it is a promise of grace to his people. He who cannot fail to give us more than we could ever deserve, will not disappoint us.
He is the one who will represent you? Can’t you represent him? You are called to represent him in a much less demanding way than he represents you. Some don’t witness at all; they try to remain secret disciples. May God bring them to an unashamed witness before this fallen world.