John Gill Commentary Psalms 119:40

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

Behold, I have longed after your precepts
After a greater degree of knowledge of them, and an opportunity of hearing them explained and enforced, and of yielding obedience to them; see (Psalms 119:7Psalms 119:20Psalms 119:27Psalms 119:30) ;

quicken me in your righteousness :
in the way of righteousness, according to the word of righteousness, the Gospel, and with the righteousness of Christ revealed in it; and which is unto life, and quickens and comforts the heart, and from which abundance of peace and joy flows.