Unselfishness underlies all true development. There is no hierarchy of value attached to spiritual gifts. They are all of equal importance. Other than the overarching value placed on love, all other gifts are equally important for the accomplishment of the work of the kingdom. This perspective places all people on the same level and focuses them on accomplishing the will of God.
Unity is a much abused and misunderstood word.
To others, it means that everyone will believe and behave exactly the same way, a perspective called uniformity. To yet others, it means that even if we don't agree on everything, we still get along and learn to live with one another as fellow travelers on the road to heaven. It is precisely in this realm of procedure, ways of doing things, that spiritual gifts apply. Our minds do not all run in the same channel, and we have not all been given the same work. God has given to every man his work according to his several ability.