“Now are you of God, little children, and have overcome him: because greater is He that is in you, than he that is in this world. They are of the world: therefore speak they of the world, and the world hears them. We are of God: he that knows God hears us; he that is not of God hears not us. From this know we the spirit of truth, and [the spirit] of error. Dearly, beloved, let us love one another: for love is of God; and every one that loves is born of God, and knows God. He that loves not knows not God; for God is love. In this was manifested the love of God in us, that God sent His only-begotten Son into this world, that we may live through Him. Herein is love, not that we loved, but that He loved us, and sent His Son to be the Atoner for our sins. Dearly beloved, if God so loved us, we ought also to love one another. No man has seen God at any time.”
Source: Homilies on the First Epistle of John (New Advent)