What is love? Is love sentiment and feeling? Is it action and commitment? Is it chiefly romantic? Is it a biological impulse that propagates our species? Depending on your understanding, you will express certain definitions and explanations - i.e. Love does. Love is love. Love wins.
The Apostle John writes that "God is Love", meaning love is chiefly defined in and through him. But what does that mean? In this last Advent teaching from Isaiah 54, we see the everlasting love God displays for his people. This love is full of compassion, but also absolutely holy. The coming of Christ at Christmas is the beginning of the greatest act of love and displays God's ferocity to deal with sin while also his steadfast love towards his people.