Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Donatist Controversy.: Chapter 70

Chapter 70.—155.  Petilianus said:  "Though the Apostle Paul says, ‘I therefore, the prisoner of the Lord, beseech you, brethren, that ye walk worthy of the vocation wherewith ye are called, with all lowliness and meekness, with long-suffering, forbearing one another in love; endeavoring to keep the unity of the Spirit in the bond of peace.’" 2168

156.  Augustin answered:  If you would not only say these words, but hearken to them as well, you would put up even with known evils for the sake of peace, instead of inventing new ones for the sake of quarreling, if it were only because you subsequently learned, for the sake of the peace of Donatus, to put up with the most flagrant and notorious wickedness of Optatus.  What madness is this that you display?  Those who are known are borne with, that a fragment may not be further split up; those of whom nothing is known are defamed, that they themselves may not remain in the undivided whole.

Footnotes

Eph. iv. 1-3.