Tertullian

But "flesh and blood," you say, "cannot inherit the kingdom of God." We are quite aware that this too is written; but although our opponents place it in the front of the battle, we have intentionally reserved the objection until now, in order that we may in our last assault overthrow it, after we have removed out of the way all the questions which are auxiliary to it.

Since, therefore, he makes the image both of the earthy and the heavenly consist of moral conduct-the one to be abjured, and the other to be pursued-and then consistently adds, "For this I say" (on account, that is, of what I have already said, because the conjunction "for" connects what follows with the preceding words) "that flesh and blood cannot inherit the kingdom of God," -he means the flesh and blood to be understood in no other sense than the before-mentioned "image of the earthy; "and since this is reckoned to consist in "the old conversation," which old conversation receives not the kingdom of God, therefore flesh and blood, by not receiving the kingdom of God, are reduced to the life of the old conversation.

Now, when it is clearly stated what the condition is to which the resurrection does not lead, it is understood what that is to which it does lead; and, therefore, whilst it is in consideration of men's merits that a difference is made in their resurrection by their conduct in the flesh, and not by the substance thereof, it is evident even from this, that flesh and blood are excluded from the kingdom of God in respect of their sin, not of their substance; and although in respect of their natural condition they will rise again for the judgment, because they rise not for the kingdom. Again, I will say, "Flesh and blood cannot inherit the kingdom of God; " and justly (does the apostle declare this of them, considered) alone and in themselves, in order to show that the Spirit is still needed (to qualify them) for the kingdom.

Otherwise, if they say that you are not in Christ, let them also say that Christ is not in heaven, since they have denied you heaven. Likewise "neither shall corruption," says he, "inherit incorruption. This he says, not that you may take flesh and blood to be corruption, for they are themselves rather the subjects of corruption,-I mean through death, since death does not so much corrupt, as actually consume, our flesh and blood.