Charles H. Spurgeon on Psalms 119:171

My lips shall utter praise, when thou hast taught we thy statutes. He will not always be pleading for himself, he will rise above all selfishness, and render thanks for the benefit received. He promises to praise God when he has obtained practical instruction in the life of godliness: this is something to praise for, no blessing is more precious. The best possible praise is that which proceeds from men who honour God, not only with their lips, but in their lives. We learn the music of heaven in the school of holy living. He whose life honours the Lord is sure to be a man of praise. David would not only be grateful in silence, but he would express that gratitude in appropriate terms: his lips would utter what his life had practised. Eminent disciples are wont to speak well of the master who instructed them, and this holy man, when taught the statutes of the Lord, promises to give all the glory to him to whom it is due.