And again in the third book of these Commentaries, on the words, "for which I am an ambassador in chains,"  after some discussion of the passage, he speaks in the character of that other' which is himself:
"Another contends that he speaks thus because of the  body of our humiliation and the chain with which we are encompassed, so that we  know not yet as we ought to know, and see  by means of a mirror in a riddle: and that he will be able to disclose the mysteries of the Gospel only when he has cast off this chain and gone forth free from his prison. Yet perhaps even in chains that man may be considered as free who has his conversation in heaven, and of whom it may be said:  "You are not in the prison nor in the flesh, but in the spirit, if so be that the spirit of God dwelleth in you."
And in the Commentary on Paul's Epistle to Philemon, at the place where he says  "Epaphras my fellow-prisoner greeteth you," some way down he says:
"Possibly, however, as some think, a more recondite and mysterious view is set before us, namely, that the two companions had been captured and bound and brought down into this vale of tears."