Ephesians 4:20-22 But that is not the way you learned Christ!— assuming that you have heard about him and were taught in him, as the truth is in Jesus, to put off your old self, which belongs to your former manner of life and is corrupt through deceitful desires,
This fact of life should be revisited from time to time: Not everyone who teaches knows what they’re talking about. Likewise, not everyone who professes to speak for God truly speaks for Him.
The Apostle Paul uses and interesting phrase in this letter to the Ephesian church. He says “assuming that you have heard about him and were taught in him, as the truth is in Jesus.” The point he’s making is that he knows the Ephesians have learned better than to live like the pagans. But what about those in the church who have learned no better than to keep living in sin?
Some will come in the name of the Lord and yet contradict His Word. Some will claim to have heard from God himself and yet present a message that goes directly against His nature. Some will even mock God with their teaching and somehow still claim to be His representative. It’s our job to discern the truth from the garbage.
If anyone teaches a gospel that contradicts the Good News that Jesus Christ died for our sins and rose again from the grave and that His work on the cross was sufficient for salvation, then they’re not worth listening to. Paul warns elsewhere that even if an angel were to preach a false gospel it should be tossed out (Galatians 1:8).
So how do we know the truth from the false teaching? It’s important to start with getting acquainted with the Bible. In it God has revealed himself and His nature. The Bible is the truth tester. If something doesn’t stand up to agreement with it, then it’s false. If you seek the truth, you will find it.