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"A man's words are a true index or evidence of his character; and they also react upon that character, and tend to confirm it for good or evil. Should, therefore, a person who has been for many years a member of a Christian Church indulge always, without restraint, in evil speaking; should he be in the habit of soiling his tongue with impure , or malicious, or false, or foolish words; what other conclusion can be drawn about his character than just that he is not a true Christian?" (The Pulpit Commentary)