Charles H. Spurgeon on Psalms 119:18

Open thou mine eyes. If it be asked, seeing David was a regenerate man, and so illumined already, how is it that he prays for the opening of his eyes? The answer is easy: that our regeneration is wrought by degrees. The beginnings of light in his mind made him long for more; for no man can account of sense, but he who hath it. The light which he had caused him to see his own darkness; and therefore, feeling his wants, he sought to have them supplied by the Lord. William Cowper.