Passage
Blessed are the undefiled in the way, who walk in the law of the LORD.
Blessed are the undefiled in the way, who walk in the law of the LORD.
Psalms 119:1 Blessed are the undefiled in the way, who walk in the law of the LORD.
Psalms 119:2 Blessed are they that keep his testimonies, and that seek him with the whole heart.
Psalms 119:3 They also do no iniquity: they walk in his ways.
The verse centers on "blessed", "undefiled", "walk", and "lord". It is saying that the verse draws attention to "blessed" and "undefiled", so its meaning should be read from those terms before moving to application.
The next verse adds "Blessed are they that keep his testimonies...", so "blessed" and "undefiled" should be read forward into that movement. 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 "blessed" and "undefiled" with trust shaped by these words, not by a vague optimism outside the passage.