Paul does not want them to be uninformed about spiritual gifts. He recalls that they were once led astray to mute idols, and gives a test: no one speaking in the Spirit of God says Jesus is accursed, and no one can say Jesus is Lord except in the Holy Spirit.
There are varieties of gifts, but the same Spirit; varieties of service, but the same Lord; varieties of activities, but the same God who empowers them all in everyone. To each is given the manifestation of the Spirit for the common good: the word of wisdom and of knowledge, faith, healing, miracles, prophecy, distinguishing of spirits, tongues and their interpretation. All are empowered by one and the same Spirit, who apportions them to each one as he wills.
Paul compares the church to a body of many members. By one Spirit all were baptized into one body, Jews or Greeks, slaves or free. If the foot said it does not belong to the body because it is not a hand, it would not be any less part of the body; if the whole body were an eye, there would be no hearing. The eye cannot say to the hand, I have no need of you, and the parts that seem weaker are indispensable. If one member suffers, all suffer; if one is honored, all rejoice.
Paul concludes that you are the body of Christ. God has appointed in the church first apostles, second prophets, third teachers, then miracles, healing, helping, administrating and tongues. Not all have the same gifts. He urges them to earnestly desire the higher gifts, and he will show them a still more excellent way.