Matthew 7:1

(1) “Judge not, that you be not judged. 
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The subject of judging often seems very difficult to grasp. Some use the term “judge” in a generalized way, making assertions such as, “We shouldn’t judge one another.” Is this true? If we took this to an extreme, we could make no evaluation of whether a person’s conduct is acceptable to God, society, or ourselves. Such a totally non-judgmental atmosphere would generate such tolerance that it would be hazardous to life and limb. Nothing would be called into question. Nothing would be wrong.

God never intended any such thing when Jesus said, “Judge not that you be not judged.” Again, if taken to an extreme, a person’s example, whether good or bad, would have no power to influence behavior in others. Before determining whether we want to imitate or reject how another person acts, we must evaluate—judge—his conduct.

— John W. Ritenbaugh