Passage
Be surety for thy servant for good: Let not the proud oppress me.
Be surety for thy servant for good: Let not the proud oppress me.
Psalms 119:120 My flesh trembleth for fear of thee; And I am afraid of thy judgments. AYIN.
Psalms 119:121 I have done justice and righteousness: Leave me not to mine oppressors.
Psalms 119:122 Be surety for thy servant for good: Let not the proud oppress me.
Psalms 119:123 Mine eyes fail for thy salvation, And for thy righteous word.
Psalms 119:124 Deal with thy servant according unto thy lovingkindness, And teach me thy statutes.
The verse centers on "for good", "surety", "servant", "proud", and "oppress". It is saying that the verse draws attention to "for good" and "surety", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 121's "I have done justice and righteousness Leave..." into verse 123's "Mine eyes fail for thy salvation And...", so "for good" and "surety" 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 "for good" and "surety" with trust shaped by these words, not by a vague optimism outside the passage.