Who are these that fly as a cloud, and as the doves to their windows?- Isaiah 60:8

The ancient church, in the foresight of her mighty increase in these latter days lifts up her hands in astonishment, and having been so used to see the Lord’s grace confined to a small nation, she exclaims in amazement, “Who are these that fly as a cloud, and as the doves to their windows?” “Is anything too hard for the Lord?” Oh! thou distrustful church, dost thou marvel because thy Lord giveth thee many children? Is it not written-“More are the children of the desolate than the children of the married wife,” saith the Lord. I tell thee, the Lord will show thee greater things than these. The increase we have had shall yet be exceeded, if God wills it. Nothing is impossible with Him. He who converts one, could as easily convert a hundred; and He who redeems a hundred, could save a thousand by the self-same power. Is not the blood of Jesus sufficient? Is not the Holy Ghost powerful enough? and is not the mighty Three-One God “able to do for us exceeding abundantly above what we can ask or think?” Yet, so it is; so little are our expectations, and so unprepared are we for God’s mercies, that when He pours out a blessing upon us, so that we have not room enough to receive it, we begin shutting up the windows altogether, and think, “Surely it cannot come from God, because there is so much of it.” Why, that is the very reason why we should believe it to be. If there were few conversions, then we might tremble, and fear lest they might be man’s; but when there are so many none but God can accomplish it. When one or two are brought to join a church, we may shake for fear and examine them with caution; but when they fly like a cloud, we can only say, “Great art Thou, O God, marvelous are Thy works, and that my soul knoweth right well.” Doubtless, brethren, until larger views of God’s power and increased faith shall diminish the wonder, we shall always stand in amazement, and say, “Who are these that fly as a cloud, and as the doves to their windows?” ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0063.cfm