Charles H. Spurgeon on Psalms 91:4

He shall cover thee with thy feathers, and under his wings shalt thou trust. A wonderful expression! Had it been invented by an uninspired man it would have verged upon blasphemy, for who should dare to apply such words to the Infinite Jehovah? But as he himself authorised, yea, dictated the language, we have here a transcendent condescension, such as it becomes us to admire and adore. Doth the Lord speak of his feathers, as though he likened himself to a bird? Who will not see herein a matchless love, a divine tenderness, which should both woo and win our confidence? Even as a hen covereth her chickens so doth the Lord protect the souls which dwell in him; let us cower down beneath him for comfort and for safety. Hawks in the sky and snares in the field are equally harmless when we nestle so near the Lord. His truth —his true promise, and his faithfulness to his promise, shall be thy shield and buckler. Double armour has he who relies upon the Lord. He bears a shield and wears an all surrounding coat of mail —such is the force of the word "buckler." To quench fiery darts the truth is a most effectual shield, and to blunt all swords it is an equally effectual coat of mail. Let us go forth to battle thus harnessed for the war, and we shall be safe in the thickest of the fight. It has been so, and so shall it be till we reach the land of peace, and there among the "helmed cherubim and sworded seraphim, " we will wear no other ornament, his truth shall still be our shield and buckler.