Jesus faces his final challenge from religious authorities before his death. Here Jesus gives his summation of the Law. Love God and love neighbor. The whole law and prophets hang on the commandment to love.
Humans are far too likely to love God unreservedly if and only if that God is in their image. Sin finds an entry point into this reality when humans desire to put themselves in the place of God. Humans, according to the Small Catechism, are then unable on their own power to rightly fear, love and trust the God who made them, let alone their neighbor. We find it far too easy to turn inward. To let our neighbors starve while we hoard our resources. We find it far too easy to chase after false images of the true God, trusting in subordinate powers, like the government or the invisible hand of the market or power or money or human reason or even our selves.
Or read it here.
Or listen to it.