St. John Cassian · c. 426–429 AD
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Section 8
FOR as our enemy separates brethren who are still weak and carnal by a sudden burst of rage on account of some trifling and earthly matter, so he sows the seeds of discord even between spiritual persons, on the ground of some difference of thoughts, from which certainly those contentions and strifes about words, which the Apostle condemns, for the most part arise: whereby consequently our spiteful and malignant enemy sows discord between brethren who were of one mind. For these words of wise Solomon are true: "Contention breeds hatred: but friendship will be a defence to all who do not strive."