"Since there are some Arminians who are more godly than some Calvinists and some Calvinists who are more godly than some Arminians, what is the correlation between true knowledge of God and godliness?
The best of both groups have historically admired the godliness of those in the other group. Whitefield, the Calvinist, said of Wesley, the Arminian, “Mr. Wesley I think is wrong in some things; yet I believe...Mr. Wesley, and others, with whom we do not agree in all things, will shine bright in glory” (Wesley and the Men Who Followed, 71).
But the sad thing about our day, unlike the days of Whitefield and Wesley, is that many infer from this that knowing God with greater truth and fullness is not important, since it doesn’t appear to be decisive in what produces godliness. Those who know what the Bible says will be protected from that mistake.
Paul correlates knowing and doing in a way that shows that knowing profoundly influences doing. Fourteen times Paul implies that our sinful behavior would be different if we knew the truth more fully. For example,
You yourselves wrong and defraud—even your own brothers! Or do you not know that the unrighteous will not inherit the kingdom of God? (1 Corinthians 6:8-9)
Flee from sexual immorality.... Or do you not know that your body is a temple of the Holy Spirit? (1 Corinthians 6:18-19)
Each one of you know how to control his own body in holiness and honor, not in the passion of lust like the Gentiles who do not know God. (1 Thessalonians 4:4-5)
All godliness is owing to truth, that is, to God as he is truly known. Truth, known with the mind and loved with the heart, is the way God produces all godliness. You will know the truth and the truth will set you free (John 8:32).
When a more godly person believes something erroneous about God, among other true things, it is not the error that God uses to produce the godliness.
And when a less godly person believes something true about God, among other false things, it is not the truth that his sin uses to produce the ungodliness.
There are various reasons why a person with a more true view of God may be less godly, and the person with a less true view of God may be more godly:
1. The person with a less true view of God may nevertheless be more submissive and more powerfully influenced by the smaller amount of truth that he has, and the person with more truth may be less submissive and less influenced by the truth he has. The Holy Spirit (the Spirit of truth) always makes truth an instrument in his sanctifying influences, but he does not always do it in proportion to the amount of truth present in the mind.
God’s revealed will is that we grow in the knowledge of Christ (2 Peter 3:18), because in that way the Spirit can make our holiness the manifest fruit of what we know of Christ, so that Christ is more clearly honored (John 16:14). But the Spirit is free to make little knowledge produce much holiness, lest those with much knowledge be proud.
2. Two persons with radically different personalities and backgrounds may have more or fewer obstacles to overcome in the process of sanctification. Therefore, the one with fewer obstacles may respond in godly ways to less truth, while the one with more obstacles may struggle more, even though he has more truth.
3. A person with much truth may lag behind in godliness because there are hindrances that arise between the truth in the mind and the response of the heart to that truth. These hindrances may include loss of memory; ease of distraction; blind spots that keep one from seeing how a truth applies to a long-held pattern of behavior; mental disorders (mild or profound) that create disconnects between thoughts and volitions; confusion and ignorance about the way sanctification is meant to work; or hidden rebellion of the heart that covers itself with a veneer of orthodoxy.
Therefore, let us humble ourselves. There are views so obscured by error that the God on the other side of the glass is not the true God. So the measure of truth in our views matters infinitely. But also, there is no guarantee that right thinking will produce right living. There is more to godliness than having clear views of God. Trusting him and loving him through those views matters infinitely."