Albert Barnes Commentary Psalms 119:104

"Through thy precepts I get understanding: Therefore I hate every false way. NUN." — Psalms 119:104 (ASV)

Through thy precepts I get understanding — a true understanding; a correct view of things; a knowledge of you, of myself, of the human character, of the destiny of man, of the way of salvation — the best, and the only essential knowledge for man. This knowledge the psalmist obtained from the “precepts” of God; that is, all that God had communicated by revelation. This passage expresses in few words what had been said more at length in Psalm 119:98-100.

Therefore I hate every false way — I see that which is right and true, and I pursue it. In proportion as I have a just knowledge of truth and duty, I hate that which is false and evil.