James 4:11-12 Speak not evil one of another, brethren. He that speaketh evil of his brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge. 12 There is one lawgiver, who is able to save and to destroy: who art thou that judgest another?
Two types of sin:
Christians commit two types of sin in the area of criticism – they are too harsh in criticizing others; and they get offended if they are criticized. Criticism can be good and/or bad. If it is designed to help a fellow Christian in their walk with the Lord, then it can be very beneficial. If it is too harsh or extreme and spoken in the wrong manner, it can become very bad, even sinful, because it enters into the realm of judging which only God is qualified to do.
Results of criticism:
Criticism, even constructive, can generate resentment, quarreling and enmity. It can damage the character of the critic as much as the recipient. It can build walls between Christians (Prov 18:19) and cause divisions.