We need to be made new, we need a fresh start with our Maker, and the Gospel is that Jesus died and rose to give us that.
I don’t need more self-esteem or self-affirmation or self-realization in order to reach my full potential as a human being. I need my evils deeds forgiven, my evil heart changed, and the power to live the loving and humble way that humans were designed to live. And the Gospel is that Jesus can give all that by the power of God.
There is nothing more humanizing than being changed by that message. There is no fuller humanity than Gospel humanity.
Now this I say and testify in the Lord, that you must no longer walk as the Gentiles do, in the futility of their minds. They are darkened in their understanding, alienated from the life of God because of the ignorance that is in them, due to their hardness of heart. But that is not the way you learned Christ!— assuming that you have heard about him and were taught in him, as the truth is in Jesus, to put off your old self, which belongs to your former manner of life and is corrupt through deceitful desires, and to be renewed in the spirit of your minds, and to put on the new self, created after the likeness of God in true righteousness and holiness.