Luther in the Large Catechism wrote in explanation to the Fourth Commandment:
If we want qualified and capable men for both civil and spiritual leadership, we must spare no effort, time, and expense in teaching and educating our children to serve God and mankind. We must not think only of amassing money and property for them. God can provide for them and make them rich without our help, as indeed he does daily. But he has given and entrusted children to us with the command that we train and govern them according to his will; otherwise God would have no need of father and mother. Therefore let everybody know that it is his chief duty, on pain of losing divine grace, to bring up his children in the fear and knowledge of God, and if they are gifted to give them opportunity to learn and study so that they may be of service wherever they are needed.
If this were done, God would richly bless us and give us grace so that men might be trained who would be a benefit to the nation and the people. We would also have soundly instructed citizens, virtuous and home-loving wives who would faithfully bring up their children and servants to be godly. Think what deadly harm you do when you are negligent in this respect and fail to bring up your children to usefulness and piety. You bring upon yourself sin and wrath, thus earning hell by the way you have reared your own children, no matter how devout and holy you may be in other respects. Because this commandment is disregarded, God terribly punishes the world; hence there is no longer any civil order, peace, or respect for authority. We all complain about this state of things, but we do not see that it is our own fault. Because of the way we train them, we have unruly and disobedient subjects.
Perhaps if Christians would spend less time involved in politics today and put the same effort into raising children in the fear of the Lord, politics in the next generation would take care of itself. For more than anything, we need people of character to lead us in the civilian realm.
Romans 10:14-15 How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them? And how can they preach unless they are sent? As it is written, “How beautiful are the feet of those who bring good news!”
So how can any of these things come to pass if those who would preach (or be candidates) are contracepted from existing in the first place?