Some people have been questioning the need to be sealed with the Holy Spirit of God. They continue to believe the falsehood that being born to "Christian" parents who had them dedicated to God as an infant, or baptized by sprinkling with water renders them immune to hell. Being well aware of their sinful condition, they take solace in misapplied verses of Scripture which speak of God's grace. God's grace is available only to the penitent, not to those who continue in deliberate sin. The concept of grace embraces and encapsulates a discontinuation of the offending action.
The best methodology for explaining the necessity of being sealed with the Holy Spirit is to work the analysis backward from the time of the rapture. The rapture will be similar to the process by which water evaporates and rises through the atmosphere to form a cloud. It leaves behind every impurity and rises in its purest form. Similarly, water that exists as steam also is in its purest form. Our bodies consist of approximately 75% water that also must relinquish every impurity in order for it to be transformed and capable of rising through the atmosphere during the rapture.
Unlike ordinary water that readily and easily relinquishes its impurities, human beings have the capacity to hold onto sin and impurity. We therefore must learn willing surrender and submission to spiritual truth. As we surrender our spiritual and physical impurities and become cleansed, we risk becoming recontaminated unless we are sealed and protected. The only available human sealant is the indwelling Holy Spirit of God whom God has sent to us to teach, heal, cleanse and sanctify us to prepare us for entry into his coming kingdom on earth. When we accept him into our hearts, the evidence of his arrival is light in the solar plexus region of the body, because God is light. Unless hindered, he instantly begins the process of sanctification and does not stop until the light in the solar plexus is emblazoned in every cell of the body and we become full of the Holy Spirit of God.