Psalms 17:8

Being compassed with enemies, David prays to God to keep him in safety. This prayer is a prediction that Christ would be preserved, through all the hardships and difficulties of his humiliation, to the glories and joys of his exalted state, and is a pattern to Christians to commit the keeping of their souls to God, trusting him to preserve them to his heavenly kingdom. Those are our worst enemies, that are enemies to our souls. They are God's sword, which cannot move without him, and which he will sheathe when he has done his work with it. They are his hand, by which he chastises his people. There is no fleeing from God's hand, but by fleeing to it. It is very comfortable, when we are in fear of the power of man, to see it dependent upon, and in subjection to the power of God. Most men look on the things of this world as the best things; and they look no further, nor show any care to provide for another life. The things of this world are called treasures, they are so accounted; but to the soul, and when compared with eternal blessings, they are trash. The most afflicted Christian need not envy the most prosperous men of the world, who have their portion in this life. Clothed with Christ's righteousness, having through his grace a good heart and a good life, may we by faith behold God's face, and set him always before us. When we awake every morning, may we be satisfied with his likeness set before us in his word, and with his likeness stamped upon us by his renewing grace. Happiness in the other world is prepared only for those that are justified and sanctified: they shall be put in possession of it when the soul awakes, at death, out of its slumber in the body, and when the body awakes, at the resurrection, out of its slumber in the grave. There is no satisfaction for a soul but in God, and in his good will towards us, and his good work in us; yet that satisfaction will not be perfect till we come to heaven.

"Keep me as the apple of the eye." No part of the body more precious, more tender, and more carefully guarded than the eye; and of the eye, no portion more peculiarly to be protected than the central apple, the pupil, or as the Hebrew calls it, "the daughter of the eye." The all-wise Creator has placed the eye in a well-protected position; it stands surrounded by projecting bones like Jerusalem encircled by mountains. Moreover, its great Author has surrounded it with many tunics of inward covering, besides the hedge of the eyebrows, the curtain of the eyelids, and the fence of the eyelashes; and, in addition to this, he has given to every man so high a value for his eyes, and so quick an apprehension of danger, that no member of the body is more faithfully cared for than the organ of sight. Thus, Lord, keep thou me, for I trust I am one with Jesus, and so a member of his mystical body. "Hide me under the shadow of thy wings." Even as the parent bird completely shields her brood from evil, and meanwhile cherishes them with the warmth of her own heart, by covering them with her wings, so do thou with me, most condescending God, for I am thine offspring, and thou hast a parent's love in perfection. This last clause is in the Hebrew in the future tense, as if to show that what the writer had asked for but a moment before he was now sure would be granted to him. Confident expectations should keep pace with earnest supplication.