Saint Paul rejoices in the knowledge that spiritual health has been restored to the human race. Death entered the world through Adam, he explains, but life has been given back to the world through Christ. Again he says: The first man, being from the earth, is earthly by nature; the second man is from heaven and is heavenly. As we have borne the image of the earthly man, the image of human nature grown old in sin, so let us bear the image of the heavenly man: human nature raised up, redeemed, restored and purified in Christ. We must hold fast to the salvation we have received. Christ was the firstfruits, says the Apostle; he is the source of resurrection and life. Those who belong to Christ will follow him. Modeling their lives on his purity, they will be secure in the hope of his resurrection and of enjoying with him the glory promised in heaven. Our Lord himself said so in the gospel: Whoever follows me will not perish, but will pass from death to life.