I love these words: “The earth is filled with your love, LORD;
teach me your decrees” (119:64).
24:1: “The earth is the LORD’s, and everything in it,
the world, and all who live in it.”
33:5: “The LORD loves righteousness and justice;
the earth is full of his unfailing love.”
104:24: “How many are your works, LORD!
In wisdom you made them all;
the earth is full of your creatures.”

The psalmist knows God’s gracious love is spread out over the world because God made it, because God’s world witnesses to his justice, and because it is filled with God’s wisdom.
I think the decrees of which he speaks in 119:64b reflect that love and he sees God’s love in the universal acclamation of God’s decrees.
No matter where the psalmist goes — and he’s been chased all over the Land — he finds God’s mercy everywhere he goes. In fact, the world is full of it — the way vessels are full to overflowing, the ocean filled with swimming creatures, a house with smoke, and the life filled with God’s Spirit.
The whole earth, he says, is filled with God’s merciful love.