3 Let letters be directed by you into the province and to the people abiding at Arles, by which, Marcian being excommunicated, another may be substituted in his place, and Christ's flock, which even to this day is contemned as scattered and wounded by him, may be gathered together. Let it suffice that many of our brethren have departed in these late years in those parts without peace; and certainly let the rest who remain be helped, who groan both day and night, and beseeching the divine and fatherly mercy, entreat the comfort of our succour.
For, for that reason, dearest brother, the body of priests is abundantly large, joined together by the bond of mutual concord, and the link of unity; so that if any one of our college should try to originate heresy, and to lacerate and lay waste Christ's flock, others may help, and as it were, as useful and merciful shepherds, gather together the Lord's sheep into the flock. For what if any harbour in the sea shall begin to be mischievous and dangerous to ships, by the breach of its defences; do not the navigators direct their ships to other neighbouring ports where there is a safe and practicable entrance, and a secure station?
Or if, on the road, any inn should begin to be beset and occupied by robbers, so that whoever should enter would be caught by the attack of those who lie in wait there; do not the travellers, as soon as this its character is discovered, seek other houses of entertainment on the road, which shall be safer, where the lodging is trustworthy, and the inns safe for the travellers? And this ought now to be the case with us, dearest brother, that we should receive to us with ready and kindly humanity our brethren, who, tossed on the rocks of Marcian, are seeking the secure harbours of the Church; and that we afford such a place of entertainment for the travellers as is that in the Gospel, in which those who are wounded and maimed by robbers may be received and cherished, and protected by the host.
Source: The Epistles of Cyprian (New Advent)