Physical succession may be attractive, but it guarantees nothing. That is precisely why we have the written Scriptures, so that the truth of God may be carefully preserved and passed on intact from believing generation to believing generation. Neither biblically instructed Christians of the 16th century nor the Fathers of the church in the early centuries believed that a mere succession of bishops guaranteed that the gospel message would be maintained in its pristine purity.
This is why Calvin’s departure from the community of physical succession was not schism. For how could agreement in the word of God be regarded as schism from the church of God?
The episcopacy that holds the church together in unity is not man’s but Christ’s. The unity of the church, therefore, is not a formal, historical reality made concrete in an institution (the college of bishops or the pope). Rather it is a dynamic reality, born out of living union and communion with the one true bishop of our souls, the Lord Jesus Christ. Rome’s fault was not only its boast in the historic episcopacy but in its failure to make confession of biblical truth and in its anathematizing of those who did. –