Sometimes just a single line jumps out and becomes my prayer:
Establish my footsteps in Your word,
And do not let any iniquity have dominion over me.
It reminds me that I need to always be on guard for sin in my life, especially that sin which so easily entangles; which brings to mind these verses from Hebrews 12:
Therefore, since we are surrounded by such a great cloud of witnesses, let us throw off everything that hinders and the sin that so easily entangles. And let us run with perseverance the race marked out for us, fixing our eyes on Jesus, the author and perfecter of faith. For the joy set before him he endured the cross, scorning its shame, and sat down at the right hand of the throne of God. Consider him who endured such opposition from sinners, so that you will not grow weary and lose heart.
Grace, Peace, and Mercy