Proverbs 26:4-5 (New King James Version)
4 Do not answer a fool according to his folly,Lest you also be like him.
5 Answer a fool according to his folly,
Lest he be wise in his own eyes.
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Ponder this: Lesson is: Don't talk to worldy people on a worldy perspective as you'll only reach a worldy conclusion. Speak to a fool (one who says in his heart that their is no God) from a God perspective (which is wise) so that they will see the foolishness in their understanding. However, there will still be some that do not understand. See 1 Corin 1:22-24 for the answer to that.
[Courtesy of KingBrown_]