Please don't ask me to explain:
Which no man could number.—“Whose number no man is able to tell (i. e., it is not a foreordained or fixed number—none were called to be of this company.)”—Rev. 5:11.
Of all nations, and kindreds, and people, and tongues.—“As the number of the Bride of Christ is to be 144,000, it would be reasonable to think that each number of this class may have 144,000 to look after, as 144,000 x 144,000 equals 20,736,000,000 (twenty billions seven hundred and thirty-six millions), evidently just about the right number to be cared for—144,000 would be quite a host for each individual of the Bride class to look after. So we can see the necessity for the work of the Great Company." - The Finished Mystery 1917