True believers should not be unnerved by the biblical call to self-examination. Unbelievers and mere hearers of the Word, on the other hand, need to have their self-confidence shaken. So the apostle John names several practical tests that may be used to determine the authenticity of faith—including such things as obedience (1 John 2:3-6; 3:1-10), sound doctrine (1 John 2:21-28; 4:1-6), and love for the brethren (1 John 3:14-19; 4:7-11). Those are fruits of true repentance.
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