Francis Schaeffer: Freedom in Worship
Someone may feel that something else is clearly commanded beyond the eight norms I have given. Others may question whether one of these is really a norm. But do not let us get bogged down at this point. My primary point as we prepare for the end of the 20th century is, on the one hand, that there is a place for the institutional church and that it should maintain the form commanded by God, but, on the other hand, that this also leaves vast areas of freedom for change.
It is my thesis that as we cannot bind men morally except with that which the Scripture clearly commands (beyond that we can only give advice), similarly, anything the New Testament does not command in regard to church form is a freedom to be exercised under the leadership of the Holy Spirit for that particular time and place. In other words, the New Testament sets boundary conditions but within these boundary conditions there is much freedom to meet the changes that arise both in different places and different times.
Francis Schaeffer, The Church at the End of the Twentieth Century, 1970 pp. 61,62,66,67.