The earth, O Lord, is full of thy mercy - Full of the proofs of thy goodness and compassion. See the notes at Psalms 33:5. This is the expression of a heart full of love to God and to his word. In such a state of mind as the psalmist was in, the goodness of God is seen everywhere. The best preparation for seeing evidence that God is good is a heart full of love. Then the proofs of that love spring up on every side - as when we truly love a friend we find constant proofs of his excellency of character.
Teach me thy statutes - I desire to see more and more of thy law. Thou art so gracious and merciful, the evidence of thy goodness is so widespread round about me, that it leads me to desire to see more and more of thyself and thy law.