Passage
Thou art good, and doest good; teach me thy statutes.
Thou art good, and doest good; teach me thy statutes.
Psalms 119:66 Teach me good discernment and knowledge; for I have believed in thy commandments.
Psalms 119:67 Before I was afflicted I went astray, but now I keep thy word.
Psalms 119:68 Thou art good, and doest good; teach me thy statutes.
Psalms 119:69 The proud have forged falsehood against me: I will observe thy precepts with [my] whole heart.
Psalms 119:70 Their heart is as fat as grease: as for me, I delight in thy law.
The verse centers on "thou", "good", "doest", "teach", and "statutes". It is saying that the verse draws attention to "thou" and "good", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 67's "Before I was afflicted I went astray..." into verse 69's "The proud have forged falsehood against me...", so "thou" and "good" belong inside that flow. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
A plain takeaway is to answer the verse's own emphasis on "thou" and "good" with trust shaped by these words, not by a vague optimism outside the passage.