In Matthew 16, Jesus didn't tell his disciples that the important thing was to discover who they were, but "Whom do men say that I the Son of man am?" and "Whom say ye that I am?" Never are we told to get to know ourselves, but to know Him; it is no more I but Christ; beholding in a glass—not our own glory or discovering who we are—but, beholding Him, we become like Him; when we see Him, we shall be like Him—not because we have at last found out who we really are in Christ, but because we will see Him as He is!
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Beloved, now are we the sons of God, and it doth not yet appear what we shall be; but we know that, when he shall appear, we shall be like him; for we shall see him as he is. ~ I John 3:2