I think there are two purposes that Scripture reveals for Spiritual Gifts. In fact, these two reasons complement one another because it’s unlikely you’ll be able to have one without the other for very long. They are:
And he gave the apostles, the prophets, the evangelists, the shepherds and teachers, to equip the saints for the work of ministry, for building up the body of Christ, (Ephesians 4:11, 12)
Building up the Body is listed as the reason that Christ has empowered some people to be apostles, prophets, evangelists, shepherds, and teachers. Another way you could translate this verse would be to say that he equipped them “for the purpose of building up the Body of Christ.” In other words, we weren’t given spiritual gifts to use them on ourselves. In fact, that idea is completely out of the question. For example, imagine a soldier whose been trained, conditioned, equipped with all his gear. The times comes for him to deploy, but instead of going to war he takes all his training and equipment and goes on a hunting trip. It’s the same way for anyone who has been granted a spiritual gift and merely uses it for their own benefit. Not only are they being selfish, they are squandering their gift on themselves when it should be used for building up the entire Church. Instead of benefitting ourselves, our spiritual gifts should be benefitting dozens–if not hundreds–of people. I should add here that when I say “building up the body” I mean both outward and upward. We should be building out–which is why there are apostles, prophets, and evangelists–and we should be building up–which is why there are shepherds and teachers. But, beware of creating an atmosphere of competition to see who has the superior spiritual gifts. This leads to division, which is antithetical to the second purpose of spiritual gifts.
…until we all attain to the unity of the faith and of the knowledge of the Son of God, to mature manhood, to the measure of the stature of the fullness of Christ… (Ephesians 4:13)
When each part is working properly, per Ephesians 4:16, the body will “build itself up in love.” The spiritual gifts are meant to build the body up, and part of being built up is being unified. Jesus said that no group which is divided against itself can stand (Mark 3:24, Matthew 12:25). This applies to the Church. If spiritual gifts are not being used properly–for example, if they are being used out of pride, selfishness, etc.–then they will inevitably be used by the Destroyer to slowly and subtly dissolve unity. Think about it, when Paul wrote that “when each part is working properly [it] makes the body grow so that it builds itself up in love (Ephesians 4:16)” he must have surely known the opposite was true. When each part is not working properly it prevents the body from growing, which means that it will destroy itself in hatred.
So what does this mean? First, it means we are called to use our spiritual gifts. Part of “working properly” is working; in other words, if you’re not serving you are not properly using your spiritual gifts, period. Second, everyone has spiritual gifts. Not all spiritual gifts are equally flashy, but all people are given spiritual gifts which means that all people are necessary if we are to reach full maturity. Finally, as we use our spiritual gifts, we must constantly check our hearts and our motives. If we are using our spiritual gifts for anything beyond building and uniting the body, we must do the hard work of checking our hearts and repenting where necessary. So I encourage you to examine where God has given you both gifts and passion. Be open to serving in several different capacities before you decide you’ve found out exactly where you fit in the Body. And remember to do all things in a manner that builds and unites the Church.