Charles H. Spurgeon on Psalms 119:105

Thy word is a lamp unto my feet, etc. Basil the Great, interpreting the "word" as God's will revealed in Holy Scripture, observes that the Old Testament, and in especial the Law, was only a lantern (lamp or candle) because an artificial light, imperfectly illumining the darkness, whereas the Gospel, given by the Lord Jesus himself, is a light of the Sun of Righteousness, giving brightness to all things. Ambrose, going yet deeper, tells us that Christ is himself both lamp and light. He, the Word of God, is a great light to some, to others he is a lamp. To me he is a lamp; to angels a light. He was a light to Peter, when the angel stood by him in the prison, and the light shined about him. He was a light to Paul when the light from heaven shined round about him, and he heard Christ saying to him, "Saul, Saul, why persecutest thou me?" And Christ is truly a lamp to me when I speak of him with my mouth. He shineth in clay, he shineth in a potter's vessel: he is that treasure which we bear in earthen vessels. Neale and Littledale.