All kinds of deception will take place. Like Satan, he will use all kinds of deception on them that perish (lit. "them that are perishing"). He wants to keep the lost, lost. Here the unbeliever is mentioned. Satan wants to deceive Christians, also.

Satan want to keep them lost. They do not love the truth. If they loved the truth, they would obey it and be saved. Why are they lost? Because they have chosen to not receive the truth.

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Old Testament