Christ has carried his flesh into heaven as a sign that ours will also reside in heaven

Jesus is still sitting there at the right hand of the Father, man, yet God—the last Adam, yet the primary Word—flesh and blood, yet purer than ours—who “shall descend in like manner as He ascended into heaven” the same both in substance and form, as the angels affirmed, so as even to be recognised by those who pierced Him. Designated, as He is, “the Mediator between God and man,” He keeps in His own self the deposit of the flesh which has been committed to Him by both parties—the pledge and security of its entire perfection. For as “He has given to us the earnest of the Spirit,” so has He received from us the earnest of the flesh, and has carried it with Him into heaven as a pledge of that complete entirety which is one day to be restored to it. Be not disquieted, O flesh and blood, with any care; in Christ you have acquired both heaven and the kingdom of God. 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.

Tertullian
On the Resurrection of the Flesh
Chapter LI

Creation is filled with symbols of the Resurrection

In a word, I would say, all creation is instinct with renewal. Whatever you may chance upon, has already existed; whatever you have lost, returns again without fail. All things return to their former state, after having gone out of sight; all things begin after they have ended; they come to an end for the very purpose of coming into existence again. Nothing perishes but with a view to salvation. The whole, therefore, of this revolving order of things bears witness to the resurrection of the dead. In His works did God write it, before He wrote it in the Scriptures; He proclaimed it in His mighty deeds earlier than in His inspired words.

Tertullian
On the Resurrection of the Flesh
Chapter XII

The body makes is possible for the soul to be saved through the sacraments of the Church

And since the soul is, in consequence of its salvation, chosen to the service of God, it is the flesh which actually renders it capable of such service. The flesh, indeed, is washed, in order that the soul may be cleansed; the flesh is anointed, that the soul may be consecrated; the flesh is signed (with the cross), that the soul too may be fortified; the flesh is shadowed with the imposition of hands, that the soul also maybe illuminated by the Spirit; the flesh feeds on the body and blood of Christ, that the soul likewise may fatten on its God. They cannot then be separated in their recompense, when they are united in their service. Those sacrifices, moreover, which are acceptable to God—I mean conflicts of the soul, fastings, and abstinences, and the humiliations which are annexed to such duty—it is the flesh which performs again and again to its own especial suffering.  Virginity, likewise, and widowhood, and the modest restraint in secret on the marriage-bed, and the one only adoption of it, are fragrant offerings to God paid out of the good services of the flesh.

Tertullian 
On the Resurrection of the Flesh
Chapter VIII

God’s promises are to both body and soul

“And He breathed upon his face the breath of life, and man (that is, the clay) became a living soul; and God placed the man whom He had formed in the garden.” So that man was clay at first, and only afterwards man entire. I wish to impress this on your attention, with a view to your knowing, that whatever God has at all purposed or promised to man, is due not to the soul simply, but to the flesh also; if not arising out of any community in their origin, yet at all events by the privilege possessed by the latter in its name.

Tertullian
On the Resurrection of the Flesh
Chapter V

We are made gods by grace and not by any property of our own

Well, then, you say, we ourselves at that rate possess nothing of God. But indeed we do, and shall continue to do—only it is from Him that we receive it, and not from ourselves. For we shall be even gods, if we, shall deserve to be among those of whom He declared, “I have said, Ye are gods,” and, “God standeth in the congregation of the gods.” But this comes of His own grace, not from any property in us, because it is He alone who can make gods.

Tertullian
Against Hermogenes
Chapter V

Tertullian argues that no one is worthy of heaven on the basis of merit

And yet the latter opinion ought to be discussed, that God conferred divine honours in consideration of meritorious claims. Well, then, if the award was made on such grounds, if heaven was opened to men of the primitive age because of their deserts, we must reflect that after that time no one was worthy of such honour; except it be, that there is now no longer such a place for any one to attain to.

Tertullian
Ad Nationes, Book II
Chapter XIII

Works cannot save a man

My most merciful and all-merciful God, O Lord Jesus Christ! In Thy great love, Thou didst come down and become flesh in order to save all. Again, I pray Thee, save me by Grace! If Thou shouldst save me because of my deeds, it would not be a gift, but merely a duty. Truly, Thou aboundest in graciousness and art inexpressibly merciful! Thou hast said, O my Christ: “He who believes in me shall live and never see death”. If faith in Thee saves the desperate, behold: I believe! Save me, for Thou art my God and my Maker. May my faith replace my deeds, O my God, for Thou wilt find no deeds to justify me. May my faith be sufficient for all. May it answer for me; may it justify me; may it make me a partaker of Thine eternal glory; and may Satan not seize me, O Word, and boast that He has torn me from Thy hand and fold. O Christ my Savior: save me whether I want it or not! Come quickly, hurry, for I perish! Thou art my God from my mother’s womb. Grant, O Lord, that I may now love Thee as once I loved sin, and that I may labor for Thee without laziness as once I labored for Satan the deceiver. Even more, I will labor for Thee, my Lord and God Jesus Christ, all the days of my life, now and ever and unto ages of ages. Amen.

Orthodox prayer for salvation by grace

The doors of Hell are locked on the inside

I willingly believe that the damned are, in one sense, successful, rebels to the end; that the doors of Hell are locked on the inside. I do not mean that the ghosts may not wish to come out of Hell, in the vague fashion wherein an envious man wishes to be “happy”; but they certainly do not will even the first preliminary stages of that self abandonment through which alone the soul can reach any good. They enjoy forever the horrible freedom they have demanded, and are therefore self-enslaved; just as the blessed, forever submitting to obedience, become through all eternity more and more free.

C.S. Lewis
The Problem of Pain

Assessing an Interpretation of Christ’s Salvation

Does it suggest a change in God or in us?
Does it separate Christ from the Father?
Does it isolate the cross from the Incarnation and Resurrection
Does it suggest Christ just appeals to our feelings — or did He change our situation?

Kallistos Ware
Salvation in Christ