Paul declares the gospel for us in 1 Cor. First, it teaches us that Christ died for our sins. Death can be defined as separation. At physical death, the body is separated from the soul, but the second death means that mankind will be separated from God. Maybe you have heard that hell is not real.
Many people deny it today, and the warning of it is stifled.
It is a literal place of eternal torment for those who have rejected Jesus Christ as Savior. When Christ shed His blood and died on the cross, He experienced the death that we deserved. He accepted the punishment we deserve. Paul wrote that if the resurrection is not certain, our faith is in vain, cf. But we must ask a question.