Robert Traill (The Lord’s Prayer, John 17:24), Works 2:247-248:
All men owe all service unto God; all true Christians are in heart devoted to his service; and the best Christians mind it most, and perform it best: but when they review their performances, they see them so faulty, and short of what they ought to be, that they see more reason to mourn over the iniquity of their holy things than to glory in their holy things. Yet notwithstanding all the failings in the sincere obedience of a true believer (and he alone is the man in whom sincerity is, and by whom any act of sincere obedience can be performed), yet are they acceptable to God by Jesus Christ, 1 Peter 2:5. Their fruits of righteousness (though far from being fully ripe and perfect) are by Jesus Christ unto the glory and praise of God, Phil. 1:11.