I was talking to someone recently about celibacy, and whilst they understood my reasons and inspiration for being celibate and could see examples of fruitful celibates in the church, they were a bit unsure about the vow. The questions was, is the vow a man-made thing? By making a vow are we going further than God intended? Are we making a rod for our own backs with that kind of “legality” when the whole thing could be done informally with a load less intensity.
To start with, God is into vows. He makes many vows or promises to the people in the Bible, and expects them to pledge themselves to Him in return. God takes vow making and vow breaking seriously, there is blessing from vow, and there is judgement for breaking vows. It is a serious thing to make a vow but I think we are poorer people if we avoid vows because of fear of commitment. But anyway, this is about celibate vows rather than the whole topic of vowing, so here goes...
If you take celibacy as an equal yet opposite thing to marriage, you could say that both states should be vowed because they are serious life long commitments. But then where did marriage vows come from?
In the Bible a couple were considered married if they had intercourse. That's why there are sentences like “so and so took knew so and so and she became his wife”. To “know” someone meant they had sex and that physical thing united them as man and wife. It also says a man shall leave his mother and father and be joined to his wife and the two shall become one. So the intimate physical union is seen as a permanent "vow”. The marriage ceremonies came in later, with all the rules about betrothal and so on. The ceremonies were a public sign of what had (or would) go on in private.
When Jesus talked about celibacy he talked about eunuchs. He said some were born eunuchs (people who could not have sex for physical reasons), some were made eunuchs by men, and some made themselves eunuchs for the sake of the kingdom of heaven (the equivalent of celibates now). Without putting it too bluntly- becoming a eunuch meant a bloke chopping his bits off. It was a physical thing and most definitely a permanent thing. To be a celibate does not mean we have to go through physical mutilation, but the sentiment is still there that what we are doing is a permanent thing. So... in the same way that a marriage vow is a public sign of a permanent personal thing, so is the celibate vow.
Keeping on the thread of a celibate vow of the same nature as a marriage vow, when people make their marriage vows they are promising to love that person only, to be true to them, and to renounce all other loves. This is not that different to the celibate vow. We promise to be true to Jesus, to renounce any other relationship for the sake of having particular intimacy with Jesus.
In the wedding vows it also talks about raising children and building family. The celibate will raise spiritual children and build church family.
It is true that you can have a relationship and not have to get married. It is true you can live as "just single" all your life and not make a celibate vow. But in all honesty I think you would be a poorer person to live without the dedication/devotion of the vow and the endurance and character strength it takes to work that out. Going back to the beginning, God is into vows and He brings blessing with the promises that we do not experience any other way.