2 Corinthians 12:15
Let us then at length come to our sober senses again, let us watch. For I fear not so much the battle without, as the fight within; for the root also, when it is well fitted into the ground, will suffer no damage from the winds; but if it be itself shaken, a worm gnawing through it from within, the tree will fall, even though none molest it. How long gnaw we the root of the Church like worms? For of earth such imaginings are begotten also, or rather not of earth, but of dung, having corruption for their mother; and they cease not from the detestable flattery that is from women. Let us at length be generous men, let us be champions of philosophy, let us drive back the violent career of these evils.
For I behold the mass of the Church prostrate now, as though it were a corpse. And as in a body newly dead, one may see eyes and hands and feet and neck and head, and yet no one limb performing its proper office; so, truly, here also, all who are here are of the faithful, but their faith is not active; for we have quenched its warmth and made the body of Christ a corpse. Now if this sounds awful when said, it is much more awful when it appears in actions. For we have indeed the name of brothers, but do the deeds of foes; and while all are called members, we are divided against each other like wild beasts.
I have said this not from a desire to parade our condition, but to shame you and make you desist. Such and such a man goes into a house; honor is paid to him; you ought to give God thanks because your member is honored and God is glorified; but you do the contrary: you speak evil of him to the man that honored him, so that you trip up the heels of both, and, besides, disgracest yourself. And wherefore, wretched and miserable one? Have you heard your brother praised, either among men or women? Add to his praises, for so you shall praise yourself also.
But if you overthrow the praise, first, you have spoken evil of yourself, having so acquired an ill character, and you have raised him the higher. When you hear one praised, become thou a partner in what is said; if not in your life and virtue, yet still in rejoicing over his excellencies. Hath such an one praised? Do thou too admire: so shall he praise you also as good and candid. Fear not, as though you were ruining your own interest by your praises of another: for this is [rather] the result of accusation of him.
For mankind is of a contentious spirit; and when it sees you speaking ill of any, it heaps on its praises, wishing to mortify by so doing; and reprobates those that are accusers, both in its own mind and to others. Do you see what disgrace we are the causes of to ourselves? How we destroy and rend the flock? Let us at length be members (of one another), let us become one body. And let him that is praised repudiate the praises, and transfer the encomium to his brother; and let him that hears another praised, feel pleasure to himself.
If we thus come together ourselves, we shall also draw unto ourselves the Head; but if we live parted from each other, we shall also put from us the aid which comes from thence; and when that is put aside, the body will receive great damage, not being bound together from above. That this then may not happen, let us, banishing ill will and envy, and despising what the many may think of us, embrace love and concord. For thus we shall obtain both the present good things and those to come; whereunto may we all attain, through the grace and love towards men of our Lord Jesus Christ, with Whom to the Father together with the Holy Ghost, be glory, might, honor, now and forever, and world without end. Amen.
Source: Homilies on Second Corinthians (New Advent)