For a long time I thought that if there was one commandment that we had obeyed, it was the Genesis command to populate the world. I thought we had, in fact, overdone it. Mabye I was wrong or maybe I was right, but either way, that time is long past.
The Western world, which means that part of the world containing most of the Christians, is not only no longer populating the world, it is depopulating it. My understanding is that in many places, our birth rate is below replacement levels. If it continues in this way, Christianity will increasingly be a fading factor on the world stage, while Islam, whose adherents are having children, will grow increasingly strong.
With that in mind, I think we need to think differently of children. Not only are they a personal blessing, but they are also a blessing to the world. They are, if I can coin a phrase, missionaries to the future.
Is what we believe important only for us? Don't future generations need to hear the gospel? Since we won't be here to share it, who will share it if not our children?