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4 He shall protect thee with his wings. This figure, which is employed in other parts of Scripture, is one which beautifully expresses the singularly tender care with which God watches over our safety. When we consider the majesty of God, there is nothing which would suggest a likeness such as is here drawn between him and the hen or other birds, who spread their wings over their young ones to cherish and protect them. But, in accommodation to our infirmity, he does not scruple to descend, as it were, from the heavenly glory which belongs to him, and to encourage us to approach him under so humble a similitude. Since he condescends in such a gracious manner to our weakness, surely there is nothing to prevent us from coming to him with the greatest freedom. By the truth of God, which, the Psalmist says, would be his shield and buckler, we must understand God’s faithfulness, as never deserting his people in the time of their need; still we cannot doubt that he had in his eye the Divine promises, for it is only by looking to these that any can venture to cast themselves upon the protection of God. As, without the word, we cannot come to the enjoyment of that Divine mercy of which the Psalmist had already spoken, he now comes forward himself to bear witness in behalf of it. Formerly, under the comparison of a fortress, he had taught that by trusting in God we shall enjoy safety and security; now he compares God to a shield, intimating that he will come between us and all our enemies to preserve us from their attacks.

5 Thou shalt not fear for the terror of the night. The Psalmist continues to insist upon the truth which I have just adverted to, that, if we confide with implicit reliance upon the protection of God, we will be secure from every temptation and assault of Satan. It is of importance to remember, that those whom God has taken under his care are in a state of the most absolute safety. Even those who have reached the most advanced experience find nothing more difficult than to rely upon Divine deliverance; and more especially when, overtaken by some of the many forms in which danger and death await us in this world, doubts will insinuate themselves into our hearts, giving rise to fear and disquietude. There was reason, therefore, why the Psalmist should enter upon a specification of different evils, encouraging the Lord’s people to look for more than one mode of deliverance, and to bear up under various and accumulated calamities. Mention is made of the fear of the night, because men are naturally apprehensive in the dark, or because the night exposes us to dangers of different kinds, and our fears are apt at such a season to magnify any sound or disturbance. The arrow, rather than another weapon, is instanced as flying by day, for the reason apparently that it shoots to a greater distance, and with such swiftness, that we can with difficulty escape it. The verse which follows states, though in different words, the same truth, that there is no kind of calamity which the shield of the Almighty cannot ward off and repel.