Twice in 1 Corinthians, Paul reminds believers that we are the Temple of God. The first is in chapter three, verses 16-17, where he says that the church as a whole is the Temple of God, and because God's Temple is holy, we should be holy as a community. The reason for that holiness is that we are the dwelling place of God's Spirit. With that statement, Paul then gives this warning: whoever defiles that Temple of God, God will destroy. Since each believer is part of that overall Temple, then each believer is responsible for what they bring into the church through their own personal lives. If it defiles your own personal holiness, then it defiles the church as whole. Therefore, every believer is accountable for the holiness of the church and how their life affects it positively or negatively.