Charles H. Spurgeon on Psalms 103:20

Hearkening unto the voice of his word. Angels are vigilant creatures, and wait for opportunities, and when they come they will not lose them. They neither slumber nor sleep, but hearken constantly what the Lord will say, what opportunity there will be for action; so, in Eze 1:11, they are described with their wings stretched upward, manifesting their watchfulness and readiness for service. When Christ was born, a multitude of them appeared and celebrated his nativity, Lu 2:13: when Christ was taken by Judas and his train, Peter drew his sword in his Master's defence; but what saith Christ? "Put up thy sword, it is not a time now to fight, but to suffer: thinkest thou that I cannot now pray to my Father, and he shall presently give me more than twelve legions of angels? It is not a time now to pray for help, I must die, and the Scripture must be fulfilled; but if I would, my Father would bid the angels to aid me, and they presently would come, whole legions of them, yea, all the angels in heaven." Let us learn of angels to watch for opportunities, and take them. There are nicks of time wherein to do the work of Christ. William Greenhill.