Video from David C. Cook
"Question: Is be fruitful and multiply a command God requires of married couples, or can we choose not to have children?" from video introduction.
Marriage Is Meant for Making Children . . . Disciples of Jesus, Part 1 - John Piper
Children, obey your parents in the Lord, for this is right. 2 “Honor your father and mother” (this is the first commandment with a promise), 3 “that it may go well with you and that you may live long in the land.” 4 Fathers, do not provoke your children to anger, but bring them up in the discipline and instruction of the Lord.
I have tried to show from Scripture that the main meaning of marriage is to display the covenant-keeping love between Christ and his church. In other words, marriage was designed by God most deeply, most importantly, to be a parable or a drama of the way Christ loves his church and the way the church loves and follows Christ. This is the most important thing for all husbands and wives to know about the meaning of their marriage..
from the article: Marriage Is Meant for Making Children . . . Disciples of Jesus, Part 1 | Desiring God