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God never allows anything to happen to the saints that would cause them to be lost. If someone departs the fellowship to follow false doctrine, you can be sure he was never saved. God uses his departure to manifest that fact.The Lord has made a glorious provision for His own--He preserves them from embracing error. John had no fear that true saints would become apostate. When someone does leave the fellowship, it proves they never were saved. John is saying in verse 21 that the Holy Spirit teach