Systematic Theology: An Introduction to Biblical Doctrine

by Wayne Grudem

Finally, a major area of evidence that we are genuine believers is found in a life of obedience to God’s commands. John says, “He who says ‘I know him’ but disobeys his commandments is a liar, and the truth is not in him; but whoever keeps his word, in him truly love for God is perfected. By this we may be sure that we are in him: he who says he abides in him ought to walk in the same way in which he walked” (1 John 2:4–6). A perfect life is not necessary, of course. John is rather saying that in general our lives ought to be ones of imitation of Christ and likeness to him in what we do and say. If we have genuine saving faith, there will be clear results in obedience in our lives (see also 1 John 3:9–10, 24; 5:18). Thus James can say, “Faith by itself, if it has no works, is dead” and “I by my works will show you my faith” (James 2:17–18). One large area of obedience to God includes love for fellow Christians.