Search me, O God, and know my heart!
Try me and know my thoughts!
And see if there be any grievous way in me,
and lead me in the way everlasting!
Let's face it: we are all sinners. We pray the above verses regularly: that God will reveal our sins to us so that we can confess, repent, and move on in grace. We ask you to pray that we will not stop doing this and that God will give us a reminder when we need it.
from "30 Ways to Pray for Missionaries," compiled by Elaine Helms for the NAMB. (the full list in pdf form is available here)