Purity is a sign of holiness. The Lord is holy and He calls you to be holy. The devil is impure and all his followers are impure. Truth makes you pure. The truth that Jesus died for you and has redeemed you makes you pure. There is no purity like that of Christ’s blood cleansing you from all sin. His blood shed for you is the detergent that is matched by none. Eternal life in the spirit makes it durable and everlasting. What Christ did on the Cross is eternal and nothing can change that. Death is final. Eternal life gained through the resurrection is also final. He has redeemed you through His sacrifice on the Cross. Now you have eternal life in Him. Now you have life because death is overcome. People live but they have to face death one day. How do you live when death is your final destination? There is no life when death is the end. However, life is vibrant and living when your destination is eternal and death is no more your end. You can devil-proof yourself by living in the Spirit and never again giving into the torments of death.
I worked as a Consultant Psychiatrist in UK and Australia for over 40 years.