And now abideth faith, hope, charity, these three; but the greatest of these is charity. – 1 Corinthians 13:13

If charity be in any man and abound, God must have the glory of it; for assuredly it was never attained by mere natural effort, but must have been bestowed by that same hand which made the heavens…What does this teach us at the outset, but that a salvation which leads to charity must be of God, and must be wrought in us by His power? Such a comely grace can never grow out of our fallen nature. Shall such a clean thing as this be brought out of an unclean? This glorious salvation unto pure love must be grasped by faith, and wrought in us by the operation of the Spirit of God. If we consider salvation to be a little thing, we bring it, as it were, within the sphere of human possibility, but if we set it forth in its true proportions as involving the possession of a pure, loving, elevated state of heart, then we perceive that it is a divine wonder. When we estimate the renewed nature aright we cry, “This is the finger of God,” and right gladly do we then subscribe to Jonah’s creed, “Salvation is of the Lord.”

When the grace of God comes into a man he is born at once to love. He that loveth is born of God, and he that is born of God loveth. He loveth Him that begat, even God, and he loveth him that is begotten of Him, even all the saved ones. He commences to obey the great command to love his neighbour as himself. His motto is no longer that of an earthly kingdom, Dieu et mon droit-God and my right; but he bears another word on his escutcheon, Dieu et mon frère-God and my brother. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1617.cfm