Charles H. Spurgeon on Psalms 119:159

Consider how I love thy precepts. Search me. Behold the evidence of my attachment to thy law. This is the confident appeal of one who was conscious that he was truly attached to God; that he really loved his law. It is similar to the appeal of Peter to the Saviour (John 21:17), "Lord, thou knowest all things; thou knowest that I love thee." A man who truly loves God may make this appeal without impropriety. He may he so confident, so certain, that he has true love for the character of God, that he may make a solemn appeal to him on the subject, as he might appeal to a friend, to his wife, to his son, to his daughter, with the utmost confidence that he loved them. A man ought to have such love for them, that he could affirm this without hesitation or doubt; a man ought to have such love for God, that he could, affirm this with equal confidence and propriety. Albert Barnes.