John Chrysostom

He who rails at others does much harm both to himself and others. First, those who hear him are rendered worse, for if sinners they are made glad in finding one as guilty as themselves, if righteous, they are exalted, being led by the sins of others to think more highly of themselves. Secondly, the body of the Church suffers; for those who hear him are not all content to blame the guilty only, but to fasten the reproach also on the Christian religion. Thirdly, the glory of God is evil spoken of; for as our well-doing makes the name of God to be glorified, so our sins cause it to be blasphemed. Fourthly, the object of reproach is confounded and becomes more reckless and immoveable. Fifthly, the ruler is himself made liable to punishment for uttering things which are not seemly.