God instructed the first humans to be fruitful, multiply and replenish the earth. Many people read this and do not put it in the proper perspective of when God so instructed Adam and Eve! Because of this, many people entirely miss God's desire and intention for populating the earth or more personally, to build a family!
When did God so instruct Adam and Eve?
BEFORE they rebelled and became sinful! In other words, while they were in their initial created state of being righteous!
There was another time that God instructed a man and his family to be fruitful, multiply and replenish the earth as well! This man was Noah and his family after the flood! What is the significance of this? God found Noah to be righteous and so spared him and his family from the flood!
Again, God instructed a RIGHTEOUS MAN to replenish the earth! This brings us to the conclusion that, above all else, God's intention is that the earth be populated with RIGHTEOUS families!
God instructed RIGHTEOUS men and women to be fruitful and multiply! By virtue of this fact we can only conclude that it is God's desire that families be the breeding ground for righteousness! That our responsibility as parents is to reproduce God's righteousness in the earth and to do so through how we raise our children!
Notice, in Scripture God never instructed the unrighteous to be fruitful! God never instructed the unrighteous to fill nor to replenish the earth! Although He never forbade the unrighteous from being fruitful, His spoken word to be fruitful was only spoken to those who were righteous!
Therefore, can we not safely conclude that God's purpose for human reproduction is to multiply righteousness in the earth! Can we not safely conclude that God's purposes for parents are to raise their offspring in righteousness and to be righteous?
I believe this to be so! For what more does the Lord say on the matter? Among others, we find the Scriptures of the Psalms to speak on this matter!
"The counsel of the Lord standeth forever, the thoughts of his heart to all generations.
Blessed is the nation whose God is the Lord; and the people whom he hath chosen for his own inheritance.
The Lord looketh from heaven; he beholdeth all the sons of men.
From the place of his habitation he looketh upon all the inhabitants of the earth.
He fashioneth their hearts alike; he considereth all their works.
There is no king saved by the multitude of an host: a mighty man is not delivered by much strength.
An horse is a vain thing for safety: neither shall he deliver any by his great strength.
Behold, the eye of the Lord is upon them that fear him, upon them that hope in his mercy;"
"Instead of thy fathers shall be thy children, whom thou mayest make princes in all the earth.
I will make thy name to be remembered in all generations: therefore shall the people praise thee for ever and ever."