5 But hear, my beloved, another word like this, which the Apostle has spoken. For he said:— The spiritual man judges everything, and he is judged by no one. And again he said:— They that are spiritual are spiritually minded, and they that are carnal are carnally minded. And again he said:— When we were in the flesh, the weaknesses of sins were working in our members that we might become fruit for death. Again he said:— If the Spirit of Christ is in you, you are spiritual. All these things the Apostle said, while he was clothed in the flesh but was doing the works of the Spirit. Thus also in the Resurrection of the dead, the righteous shall be changed, and the earthly form shall be swallowed up in the heavenly, and it shall be called a heavenly body. And that which shall not be changed, shall be called earthly.
Source: Demonstrations (New Advent)