Charles Spurgeon Commentary Jeremiah 33:19-22

"And the word of Jehovah came unto Jeremiah, saying, Thus saith Jehovah: If ye can break my covenant of the day, and my covenant of the night, so that there shall not be day and night in their season; then may also my covenant be broken with David my servant, that he shall not have a son to reign upon his throne; and with the Levites the priests, my ministers. As the host of heaven cannot be numbered, neither the sand of the sea measured; so will I multiply the seed of David my servant, and the Levites that minister unto me." — Jeremiah 33:19-22 (ASV)

So that they are today the seed of Jesus, the Son of David, who can count them? And the company of those whom He has made to be kings and priests to God, who but He can count them?