Love is not god. God is love. So, we don't get love right if we don't get God right. One of the key themes in John is the right understanding of the key of Christian faith - the gift of God in the incarnation of Christ. If you don't get that right, you don't get love right. But if you don't love one another, then you also haven't understood god. So, we learn love by abiding in the revealed love of the Father, Son and Spirit.