3 But, dearest brother, ecclesiastical discipline is not on that account to be forsaken, nor priestly censure to be relaxed, because we are disturbed with reproaches or are shaken with terrors; since Holy Scripture meets and warns us, saying, “But he who presumes and is haughty, the man who boasts of himself, who has enlarged his soul as hell, shall accomplish nothing.” And again: “And fear not the words of a sinful man, for his glory shall be dung and worms. Today he is lifted up, and tomorrow he shall not be found, because he is turned into his earth, and his thought shall perish.” And again: “I have seen the wicked exalted, and raised above the cedars of Libanus: I went by, and, lo, he was not; yea, I sought him, and his place was not found.” Exaltation, and puffing up, and arrogant and haughty boastfulness, spring not from the teaching of Christ who teaches humility, but from the spirit of Antichrist, whom the Lord rebukes by His prophet, saying, “For you have said in your heart, I will ascend into heaven, I will place my throne above the stars of God: I will sit on a lofty mountain, above the lofty mountains to the north: I will ascend above the clouds; I will be like the Most High.” And he added, saying, “Yet you shall descend into hell, to the foundations of the earth; and they that see you shall wonder at you.” Whence also divine Scripture threatens a like punishment to such in another place, and says, “For the day of the Lord of hosts shall be upon every one that is injurious and proud, and upon every one that is lifted up, and lofty.” By his mouth, therefore, and by his words, is every one at once betrayed; and whether he has Christ in his heart, or Antichrist, is discerned in his speaking, according to what the Lord says in His Gospel, “O generation of vipers, how can you, being evil, speak good things? For out of the abundance of the heart the mouth speaks. A good man out of the good treasure brings forth good things; and an evil man out of the evil treasure brings forth evil things.” Whence also that rich sinner who implores help from Lazarus, then laid in Abraham's bosom, and established in a place of comfort, while he, writhing in torments, is consumed by the heats of burning flame, suffers most punishment of all parts of his body in his mouth and his tongue, because doubtless in his mouth and his tongue he had most sinned.
Source: The Epistles of Cyprian (New Advent)