Charles Ellicott Commentary Psalms 119:40

"Behold, I have longed after thy precepts: Quicken me in thy righteousness. VAV." — Psalms 119:40 (ASV)

Quicken me in thy righteousness — i.e., Let the sense of your eternal justice give me vigor and life. Or the thought may be of the invigorating influence of a complete surrender to a righteous law, as in Wordsworth’s Ode to Duty —

“I myself commend
To your guidance from this hour.
Oh let my weakness have an end!
Give to me, made lowly, wise,
The spirit of self-sacrifice.
The confidence of reason give,
And in the light of truth let me, your bondsman, live.”