I tried to explain a couple of days ago why Jesus affirms in the New Testament that Love of God must come first - and what it means to 'come first'. But the picture is incomplete without the knowledge that God loves us, each and individually, as children.
Firstly, God is the creator; so that this world is God's work - and 'creation' includes create-ing, moment to moment.
Then God loves us as ideal parents love their children - all and each. God wants for each and all children to grow, spiritually, each in his own way - to become 'Sons of God'.
This means that the world has meaning, being organised around this principle and aimed-at this result; raising Men to become Sons of God by their experiences and choices; which means dwelling in Heaven and (at least some Men) growing-up spiritually towards greater divinity.
So this Love by God (who is creator) structures the world. Then comes our personal love for God. What this means is that we come to know that God is creator and loving parent; and, knowing this, we ourselves come to love this reality.
It is a close analogy with human families of the best sort. The parents will love the children - but for the family to work requires that the children also love the parents - which means the children wish to join with the work and purposes of the family. This is decided by each child as he matures - will I, do I, love my parents?
The wishes of the individual children are all the while being harmonised by their love for each other (i.e. love of neighbour) as well as the (primary) love of God (i.e. love of God: love of the basic set-up, full accord with Gods basic motivations in creation).
So love by God is a fact; but love for God is our decision.
And that's it.