And therefore God, the Creator of all, caring above everything for the restoration of His handiwork, and knowing that the root and cause of offenses lie not in others but in our own selves, has bade us not to separate ourselves from consort with the brethren, nor to avoid those whom we think that we have injured or that they have injured us, but rather to soothe their feelings, knowing that a perfect heart is acquired, not by drawing apart from men, but by the virtue of patience. This virtue, when it is firmly held, will make us to hold to the love of peace even with them that hate peace, and when we possess it not, our lack thereof makes us constantly at enmity with those who may be perfect and higher in virtue than we. For it needs must be that, in the course of human intercourse, occasions of perturbation will arise which will make us hurry to quit the company of those to whom we are bound, and for this reason, when we leave one set of companions for another, we are not ridding ourselves of causes of sadness, but only changing them.

+St. John Cassian, Selected Writings of St. John Cassian the Roman