Mark 6:17a (ACCS Mk (Rev)): Tertullian: Set aside for a moment the term “prison.” Just call it a temporary retirement. Even though the body is imprisoned, even though the flesh is confined, everything still remains open to the spirit. Walk back and forth, my spirit, not thinking of shady walks or long cloisters, but of the road that leads directly to God. As often as you shall walk in this way in the spirit, so often shall you find yourself not in prison. On Martyrdom 2.
Mark 6:18 (ACCS Mk (Rev)): Chrysostom: John saw a man that was a tyrant overthrowing the divine commands on marriage. With boldness, he proclaimed in the midst of the forum, “It is not lawful for you to have your brother Philip’s wife.” So we learn from him to admonish our fellow servant as an equal. Do not shrink from the duty of chastising a brother, even though one may be required to die for it.