Passage cross-references.

He that loveth not knoweth not God; for God is love.

If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen? …

Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:

He that loveth his brother abideth in the light, and there is none occasion of stumbling in him.

But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith,

For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.

But as touching brotherly love ye need not that I write unto you: for ye yourselves are taught of God to love one another. …

No man hath seen God at any time. If we love one another, God dwelleth in us, and his love is perfected in us.

In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother. …

If ye know that he is righteous, ye know that every one that doeth righteousness is born of him.

And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.

And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live.

For God, who commanded the light to shine out of darkness, hath shined in our hearts, to give the light of the knowledge of the glory of God in the face of Jesus Christ.

But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?