In the final paragraph of Psalm 119, in v. 171, the psalmist erupts into praise and he describes before God what his experience is (or will be) like.
“May my lips overflow with praise for youi teach me your decrees.”
It seems the second part assumes the reality of the first part: he knows the experience of learning from God.
He knows what it is like to sit with the Torah and meditate and wait upon God. He knows what it is like for God to visit him, to teach him, to enlighten him, and to make clear his paths as he seeks to walk the way of Torah.
V. 172 largely repeats the point: “May my tongue sing of your word for all your commands are righteous.”
He delights in God as God speaks through the Word and he sings praise for what he has learned.