A chiasm is a literary structure where vocabulary of the first section of a passage is repeated in the second. The center of the chiasm is typically the climax of the passage. In Acts 20:17-38 the center and climax is Paul’s words of farewell to the Ephesian elders, “Pay careful attention to yourselves and to all the flock, in which the Holy Spirit has made you overseers, to care for the church of God, which he obtained with his own blood. I know that after my departure fierce wolves will come in among you, not sparing the flock; and from among your own selves will arise men speaking twisted things, to draw away the disciples after them” (Acts 20:28-30).