Passage
The goodness of reason and knowledge teach me, For in Thy commands I have believed.
The goodness of reason and knowledge teach me, For in Thy commands I have believed.
Psalms 119:64 Of Thy kindness, O Jehovah, the earth is full, Thy statutes teach Thou me!
Psalms 119:65 <FI> Teth.<Fi> Good Thou didst with Thy servant, O Jehovah, According to Thy word.
Psalms 119:66 The goodness of reason and knowledge teach me, For in Thy commands I have believed.
Psalms 119:67 Before I am afflicted, I--I am erring, And now Thy saying I have kept.
Psalms 119:68 Good Thou <FI>art<Fi> , and doing good, Teach me Thy statutes.
The verse centers on "goodness", "reason", "knowledge", "teach", "commands", and "believed". It is saying that the verse draws attention to "goodness" and "reason", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 65's "FI Teth Fi Good Thou didst with..." into verse 67's "Before I am afflicted I--I am erring...", so "goodness" and "reason" 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 "goodness" and "reason" with trust shaped by these words, not by a vague optimism outside the passage.