For in Christ Jesus neither circumcision nor uncircumcision avails anything, but a new creation. – Galatians 6:15

I love Thee, O my Saviour, because on the cross Thou didst bear shame, and spitting, and manifold disgrace for me. New principles stir the new nature which God has given. And this new nature is conscious of new emotions. It loves what once it hated; it hates what once it loved. It finds blight where once it sought for bliss, and finds bliss where once it found nothing but bitterness. It leaps at the sound which was once dull to its ears-the name of a precious Christ. It rejoices in hopes which once seemed idle as dreams. It is filled with a divine enthusiasm which it once rejected as fanatical. It is conscious now of living in a new element, breathing a fresh air, partaking of new food, drinking out of new wells not digged by men nor filled from the earth. The man is new-new in principles, and new in emotions…He was an heir to wrath; he is now a child of God. He was a bond-slave; he is now a freeman…He rejoices in Christ Jesus, and feasts to the full. He was the citizen of earth once; he is now a citizen of heaven. He once found his all beneath the clouds; but now his all is beyond the stars. He has new relationships. Christ is his brother; God is his Father; the angels are his friends; and the despised people of God are his best and nearest kinsfolk. And hence the man has new aspirations. He now pants to glorify God. What cared he about the glory of God once? He now pants to see God; once he would have paid the fare, if it had cost his life, that he might escape from the presence of the Lord. Now he hungers and thirsts after the living God; yea, if his soul had wings, and he could break the fetters of this mortality, he would mount at once to dwell where Jesus is.

Dear friends, are you new men? If you are, you understand what it is; if you are not, I know I cannot explain it to you. Oh! to be born again is a great mystery; blessed is the soul that comprehends it! But he that knows it not will never learn it by the lip; he can only know it by the Spirit of God causing him also to be made a new creature in Christ Jesus. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3467.cfm