“…it is best therefore to understand these words of the light of nature, and reason, which Christ, as the word, and Creator and light of men, gives to every man that is born into the world; and … which every man has, and is no other than the light of a natural conscience; and shows how much men, even natural men, are obliged to Christ, and how great a person he is, and how deserving of praise, honour, and glory.”

According to Scripture it is quite impossible to be justified by faith and not experience the commencement of true sanctification, because the spiritual life communicated by the Spirit in the act of regeneration (which introduces the new power to believe) is morally akin to the character of God and contains within it the germ of all holiness.

What was the doctrine that the Pharisees confessed and taught? Luke 18:9 gives us the very heart of Pharisaism: " And he spake this parable unto certain which trusted in themselves that they were righteous, and despised others” Here is Pharisaism in all its wickedness. First, the Pharisees "trusted in themselves, that they were righteous…They trusted in themselves - they had confidence in themselves - that they were righteous. They believed that their own works - their doing what God commands and their abstaining from what God forbids - were what gained and maintained God's favor and recommended them to God. They believed that their justification, their sanctification, their perseverance, and their entitlement to heaven, were conditioned on themselves. They believed that one's own righteousness is what makes the difference between heaven and hell. This is the epitome of self-righteousness.

In the first half of Matthew 15:9, Jesus said that the Pharisees were worshiping God in vain…But how do we know they were worshiping in vain? Look at the second half of Matthew 15:9. We know that they were worshiping in vain because of their DOCTRINE. They were "teaching for doctrines the commandments of men.”(Matthew 15:9b). Their doctrine was not the doctrine of Holy Scripture. Their doctrine was man-made tradition (Matthew 15:6). They did not abide in the doctrine of Christ (2 John 9). They did not make their judgments based on Scripture; instead, they made them based on their own (and their fathers') vain imaginations.

It is Christ revealing in it’s witness
John 5:39

But as there are fanatics who rashly strain and torture this passage, so as to infer from it that the grace of illumination is equally offered to all, let us remember that the only subject here treated is the common light of nature, which is far inferior to faith; for never will any man, by all the acuteness and sagacity of his own mind, penetrate into the kingdom of God. It is the Spirit of God alone who opens the gate of heaven to the elect. Next, let us remember that the light of reason which God implanted in men has been so obscured by sin, that amidst the thick darkness, and shocking ignorance, and gulf of errors, there are hardly a few shining sparks that are not utterly extinguished.

“…it is best therefore to understand these words of the light of nature, and reason, which Christ, as the word, and Creator and light of men, gives to every man that is born into the world … which every man has, and is no other than the light of a natural conscience; and shows how much men, even natural men, are obliged to Christ, and how great a person he is, and how deserving of praise, honour, and glory.”

Earnest Sandeen, The Roots of Fudamentalism: 1800-1920, (Chicago: University of Chicago Press, 1970) page 224

"Perseverance of the Saints does not mean "once saved always saved". This corruption of the doctrine has been popular in recent years, but has never been a true representation of the doctrine. "Once saved always saved" is more keenly given the name "Perseverance of the sinner" instead of "the saint". For it teaches that man can be saved by Christ and then sin habitually, do whatever he wants, and then still "persevere to the end". Perseverance of the saints does not teach this. Perseverance of the saints teaches that once God has renewed the heart of a sinner through the application of the redemption wrought by Christ upon the cross, he will continue to be saved and show forth the fruits of that salvation. The sinner perseveres because of Christ, but he continually shows himself as one who has been changed by Christ. God has saved the individual and will sanctify him until the end when he is ultimately glorified, and in heaven. It does not mean man has a license to sin. Those who think they have a license to sin are not changed and saved by grace. They are still in sin. Those who are saved by grace and changed, desire to show forth the fruits of that salvation."