Psalms 103:20

Angels; which, though glorious creatures, are but his ministers and messengers, as the word signifies. And inviting the angels to bless God, he quickens men to the same duty, as having more dependence upon God, and, obligation to him. That excel in strength; of which see evidence 2 Kings 19:35. You are freed from the impentencies and infirmities of mankind. That do his commandments; that live in a universal, constant, and perfect obedience to all God's commands, which the best of men through the infirmity of the flesh do frequently violate. Hearkening unto the voice of his word; that diligently wait for God's commands or errands, and execute them with all cheerfulness and readiness.