[John 3:15 that whoever believes in Him should not perish but have eternal life.]

If you believe in Jesus and you are born again, filled with the Spirit of God, you have the life and Nature of God in you and therefore you cannot perish. That is what the Apostle John is revealing to us in our opening verse. Jesus Christ is the Son of God bearing the life and nature of God. So anyone who believes in Him and receives Him as Lord and Savior, receives the same life and the nature of God. The Bible refers to this as eternal life. This eternal life cannot perish. It is immune to destruction. It is immune to sickness and disease. If you give yourself to the Spirit of God He will teach you the mysteries of this life. Then you will realize all your fears have no foundation. You are in Christ and Christ is in you. You have become one with divinity, glory to God forever and ever.