Jesus is the source and definition of love - no other source but Jesus

For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.

For God did not send His Son into the world to condemn the world, but that the world through Him might be saved.

Behold what manner of love the Father has bestowed on us, that we should be called children of God! Therefore the world does not know us, because it did not know Him.

Beloved, now we are children of God; and it has not yet been revealed what we shall be, but we know that when He is revealed, we shall be like Him, for we shall see Him as He is.

And everyone who has this hope in Him purifies himself, just as He is pure.