In 1 cor 13, Paul says that spiritual gifts are useless without love. He then provides an extensive description of love, which can be summarized as "unselfish". Since the purpose of the manifestations of the Spirit ( spiritual gifts) is the edification and building up of the body of Christ, it seems to make sense that love is the mechanism of action by which the gifts are employed. Paul concludes by explaining that only faith, hope, and love are eternal, and the manifestations of the Spirit will no longer be necessary when we are someday in the eternal presence of God.