Multiply and barren

There are 2 pastors in a small town, each of them have
8sons and daugthers. Why they raise a big family like that?

They told the congregation why, that according to the Bible, God wanted human to multiply on earth...so both pastors bear many sons and daugthers, to increase the number of Christians on earth...the pastors qouted Genesis 9:7, "As for you, be fruitful and increase in number; multiply on the earth and increase upon it."

But then in another place, at the later time, in New Testament, the Bible say in...Luke 23:29
"For the time will come when you will say, 'Blessed are the barren women, the wombs that never bore and the breasts that never nursed!"

Galatians 4:27
For it is written: "Be glad, O barren woman, who bears no children; break forth and cry aloud, you who have no labor pains; because more are the children of the desolate woman than of her who has a husband."

Whenever I see them, I will think about the number of children, I will also keep on thinking about these few verses in the Bible.

Wondering...wondering..wondering...the pastors' application...how to increase the number of Christians on earth..