The Defining Matter

What does everyone think of this statement?

"The defining matter of the church's life is not to convert and bring people to faith (the evangelical heresy) or to bring in the ethical commonwealth (the liberal heresy). The defining matter for the church's life, for which the church exists, is to bear witness to Jesus Christ. He, not we, converts people and brings in the reign of God."

The Crucifixion of Ministry, page 132