Charles H. Spurgeon on Psalms 119:169

Give me understanding. This was the prayer of Solomon (1 Kings 3:9), and we are told that it pleased the Lord, and as a reward he added temporal prosperity, which the young king had not asked. Yet Solomon meant less by his prayer than his father David did; for we see in him little trace of the deep devotion for which his father was so remarkable. The Psalmist here prays a deep prayer which can only be answered by the Holy Ghost himself enlightening the soul. The understanding is a most important member of our spiritual frame. Conscience is the understanding exercised upon moral questions, and if that be not right, where shall we be? Our understanding of the word of God comes by teaching, but also through experience: we understand hardly anything till we experience it. Such an enlightening experience is the gift of God, and to him we must look for it in prayer. C.H.S.