I appreciated John Piper’s recent answer to this tough question. His last couple paragraphs sum up his argument.
Look, he’s God. He’s God! It is just like God to bless his mission-minded followers with the desires of their heart. God knows what we need. God is good. God is wise. God is sovereign. God is able to do what seems impossible for man to do.
So, I return to my wife’s first thought: How serious and how deep and how confident is this sense of calling in this young woman? Because if it is serious and deep, then probably she should set her face, her heart, to pursue it and trust God that, on that path, she will find her greatest joy and do the world the greatest good and bring Christ the greatest honor.
We simply don’t know what God has in store. If God has been clear and given a calling to go to the nations, and then along comes a potential spouse who is not interested in that kind of life of service, then wisdom would seem to suggest either converting them to missions (as my mom did to my dad), or leaving that potential spouse behind. When God has been clear, we need to move on that clarity – and trust him with the fallout. When we do, we will often find the desires of our hearts met in unexpected ways.
This is a bigger risk for single women than it is for single men. Single men are outnumbered overseas by single women by a scandalous ratio something like of ten to one. For any godly ministry-minded man who is wondering where all the amazing women of God are – get thee to the mission field! Wonderful single missionary ladies are out here, serving faithfully and risking much. But even for single ladies who feel called to both missions and marriage, many faithful brothers are out here too. For both men and women, let us also not discount the goodness of cross-cultural marriages. Some of our closest friends in the US are a formerly single missionary who fell in love with a godly Middle Eastern brother. And let us also not discount the goodness of godly celibacy. Our evangelical culture still tends to not celebrate this as much as the Scriptures do.
We cannot promise one another anything – only God knows the future. Some find spouses on the mission field. Some live lives of devoted singleness. Some lose their spouses on the mission field. My parents went to the mission field together, only for my mom to become a widow three and a half years later. She later continued on the field as a single mom for 7 years.
The key is walking in obedience to the Holy Spirit. Has he unmistakably called you to the nations? Then go. And trust God with the consequences. He is worthy of this. Those who risk their deepest desires for him are never put to shame. Somehow, in some unexpected way, he will give them back better things than those sacrificed – even a hundredfold – and in the age to come, will give eternal life.