What did David know that the church has missed?

It will happen that when he (a renegade) hears the words of this oath, and he imagines himself as blessed, saying, ‘I will have peace and safety even though I walk within the stubbornness of my heart [rejecting God and His law], in order that the watered land dwindles away along with the dry [destroying everything],’ the Lord will not be willing to forgive him, but then the anger of the Lord and His jealousy will burn against that man, and every curse which is written in this book will rest on him; the Lord will blot out his name from under heaven. Deuteronomy 29:19-20 AMP

David had experienced God and faith in Him first hand. His word had he hid in his heart. He knew the hand of God upon his life. He knew the blessings and the curses of Torah. He had seen the blessings and the curses in effect in King Saul’s life.

Then it happened when Saul turned his back to leave Samuel, God changed his heart; and all those signs came to pass that day. 1 Samuel 10:9 AMP

When Samuel saw Saul, the Lord said to him, “ Behold, the man of whom I spoke to you! This one shall rule over My people.” Then the Spirit of the Lord will come upon you mightily, and you shall prophesy with them and be changed into another man. Then it happened when he turned his back to leave Samuel, God changed his heart; and all those signs came about on that day. When they came to the hill there, behold, a group of prophets met him; and the Spirit of God came upon him mightily, so that he prophesied among them. 1 Samuel 9:17,10:6,9-10 NASB

David had known of Saul’s exploits, and he knew first hand about the removal of God’s Holy Spirit from him. He was called upon to minister to Saul when he came under the influence of an evil spirit.

Now the Spirit of the Lord departed from Saul, and an evil spirit from the Lord terrorized him. 1 Samuel 16:14 NASB

And Paul says to us:

For you know what commandments we gave you by the authority of the Lord Jesus. For this is the will of God, your sanctification; that is, that you abstain from sexual immorality; and that no man transgress and defraud his brother in the matter because the Lord is the avenger in all these things, just as we also told you before and solemnly warned you. For God has not called us for the purpose of impurity, but in sanctification. So, he who rejects this is not rejecting man but the God who gives His Holy Spirit to you. 1 Thessalonians 4:2-3,6-8 NASB

Let no unwholesome word proceed from your mouth, but only such a word as is good for edification according to the need of the moment, so that it will give grace to those who hear. Do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption. Ephesians 4:29-30 NASB

The fear of God is the beginning of wisdom no matter where we are in our walk with the lord. Fear designates danger. We are told to be sure of one thing:

Take care, brethren, that there not be in any one of you an evil, unbelieving heart that falls away from the living God. Hebrews 3:12 NASB

We can harden our heart, when we ignore the checks from the Holy Spirit, the warnings that designate fear of reprisal from disobedience. When we go against the word of the Lord we in effect are denying the one who bought us. He chastens those whom He loves. That means you and me. We either respond to His chastening or we don’t. Don’t neglect so great a salvation.