Thou crownest the year with Thy goodness; and Thy paths drop fatness.
PSALM 65:11 (KJV)
This means that the saints, through whom and in whom Christ works and dwells, are His tracks, as He says, Leviticus 26:11-12: "I will dwell in them and walk among them and be their God, and they will be My people." Furthermore, in Ezekiel 43:7: "The place of My throne and the place of the soles of My feet, where I dwell in the midst of the children of Israel forever." Again, Psalm 132:7: "We will adore in the place where His feet stood." Therefore works of strength are the going and passing of God. When we therefore accomplish them in the body, God is imprinting His footprints on us. For through such works it is recognized that God is in us, as the passing of a man is known by his footprints. Therefore the footprints of truth, wisdom, and righteousness, which God is in us, become apparent through the works of such things in our body. And so the earth is His footstool, on which His footprints are impressed. The soul, however, is His throne, because it is heaven. Therefore such tracks drip with fatness, that is, they are flooded with spiritual joy from above, since every good work gladdens the conscience and the soul.
From First Lectures on the Psalms, on Psalm 65 (Luther's Works 10:315-16)