20 This charity, however, must not refuse to embrace also those who have gone astray from the path of truth; and of this we may see an example in St. Cyril's remarkable conduct. Vigorously though he fought against the heresy of Nestorius, yet such was the ardent charity which animated him that, as he openly declared, he yielded to none in his love for Nestorius himself. And in this he was right. Those who wander from the straight path are to be considered as ailing brethren, and treated with gentle and loving care. The Patriarch of Alexandria's prudent advice on this point is worth quoting: This is a matter calling for the greatest moderation. . . . In many cases a violent clash only drives people to insolence; and it is better to treat your opponents with kindness than to make them suffer by applying the rigor of the law. If they were physically ill you would handle their bodies gently; so in like manner prudence is the best medicine to use in the treatment of ailing souls. Gradually they too will be brought to a proper state of mind.
Source: Orientalis Ecclesiae (Vatican.va)