Going back to the foundations will not help those who have deliberately turned away from God

^4-8 When you find men who have been enlightened, who have experienced salvation and received the Holy Spirit, who have known the wholesome nourishment of the Word of God and touched the spiritual resources of the eternal world and who then fall away, it proves impossible to make them repent as they did at first. For they are re-crucifying the Son of God in their own souls, and by their conduct exposing him to shame and contempt. Ground which absorbs the rain that is constantly falling upon it and produces plants which are useful to those who cultivate it, is ground which has the blessing of God. But ground which produces nothing but thorns and thistles is of no value and is bound sooner or later to be condemned—the only thing to do is to burn it clean.