Psalm 119:93 "I will never forget thy precepts: for with them thou hast quickened me."
A child of God will never forget the day that God saved them from their sinful condition. But something else that they will never forget is God's Word. When a person gets saved they are quickened in their spirit. That means they are made alive. Before getting saved a person is dead spiritually. But once they see themselves a sinner on their way to hell and in need of a Saviour and ask the Lord Jesus to come into their heart and life they are made alive or quickened.
A saved person will never forget God's Word because they have the Holy Spirit indwelling them and He won't let them forget God's Word. A dead person cannot feel so it doesn't bother them like it does a saved person. When a saved person gets out of God's will the Holy Spirit will constantly be trying to bring them back to Him. And He uses God's Word to do that. The saved person may have their sense of drawing dulled somewhat by sin in their life but they will never be past the point of being dealt with until God takes them out of this world to be with Him. I believe many saved people cross that line where God sees no recourse other than to take them home with Him. But it is not without God having dealt with them about their sin constantly. That is why a person who is out of the will of God is never happy. The Holy Spirit is always nudging that heart to get right with Him.
So I believe that a saved person will never forget God's Word and what they have read or heard preached. The Holy Spirit won't let them forget. Thank God for the Holy Spirit and the Word of God that He uses to draw us back to Him.