Men are not totally depraved. Only Christ was without sin, being himself God.

There is, then, besides the evil which supervenes on the soul from the intervention of the evil spirit, an antecedent, and in a certain sense natural, evil which arises from its corrupt origin. For, as we have said before, the corruption of our nature is another nature having a god and father of its own, namely the author of (that) corruption.  Still there is a portion of good in the soul, of that original, divine, and genuine good, which is its proper nature.  For that which is derived from God is rather obscured than extinguished. It can be obscured, indeed, because it is not God; extinguished, however, it cannot be, because it comes from God. As therefore light, when intercepted by an opaque body, still remains, although it is not apparent, by reason of the interposition of so dense a body; so likewise the good in the soul, being weighed down by the evil, is, owing to the obscuring character thereof, either not seen at all, its light being wholly hidden, or else only a stray beam is there visible where it struggles through by an accidental outlet. Thus some men are very bad, and some very good; but yet the souls of all form but one genus: even in the worst there is something good, and in the best there is something bad. For God alone is without sin; and the only man without sin is Christ, since Christ is also God.

Tertullian
A Treatise on the Soul
Chapter XLI

We will be raised in our own bodies to be judged and sentenced irrevocably

Accordingly, God’s judgment will be more full and complete, because it will be pronounced at the very last, in an eternal irrevocable sentence, both of punishment and of consolation, (on men whose) souls are not to transmigrate into beasts, but are to return into their own proper bodies. And all this once for all, and on “that day, too, of which the Father only knoweth;” (only knoweth,) in order that by her trembling expectation faith may make full trial of her anxious sincerity, keeping her gaze ever fixed on that day, in her perpetual ignorance of it, daily fearing that for which she yet daily hopes.

Tertullian
A Treatise on the Soul
Chapter XXXIII

The body and soul are created together

How, then, is a living being conceived? Is the substance of both body and soul formed together at one and the same time? Or does one of them precede the other in natural formation? We indeed maintain that both are conceived, and formed, and perfectly simultaneously, as well as born together; and that not a moment’s interval occurs in their conception, so that, a prior place can be assigned to either.

Tertullian
A Treatise on the Soul
Chapter XXVII

Heretics believe in preexistence of the soul

I am sorry from my heart that Plato has been the caterer to all these heretics. For in the Phædo he imagines that souls wander from this world to that, and thence back again hither; whilst in the Timæus he supposes that the children of God, to whom had been assigned the production of mortal creatures, having taken for the soul the germ of immortality, congealed around it a mortal body,—thereby indicating that this world is the figure of some other. Now, to procure belief in all this—that the soul had formerly lived with God in the heavens above, sharing His ideas with Him, and afterwards came down to live with us on earth, and whilst here recollects the eternal patterns of things which it had learnt before—he elaborated his new formula, μαθήσεις ἀναμνήσεις, which means that “learning is reminiscence;” implying that the souls which come to us from thence forget the things amongst which they formerly lived, but that they afterwards recall them, instructed by the objects they see around them. Forasmuch, therefore, as the doctrines which the heretics borrow from Plato are cunningly defended by this kind of argument, I shall sufficiently refute the heretics if I overthrow the argument of Plato.

Amongst so many nations, in so great a crowd of sages, Plato, to be sure, is the only man who has combined the oblivion and the recollection of ideas. Now, since this main argument of his by no means keeps its ground, it follows that its entire superstructure must fall with it, namely, that souls are supposed to be unborn, and to live in the heavenly regions, and to be instructed in the divine mysteries thereof; moreover, that they descend to this earth, and here recall to memory their previous existence, for the purpose, of course, of supplying to our heretics the fitting materials for their systems.

Tertullian
A Treatise on the Soul
Chapter XXIII & XXIV

The senses are not inferior to the intellect

Two conclusions therefore follow from what we have said: (1) That the intellect is not to be preferred above the senses, on the (supposed) ground that the agent through which a thing exists is inferior to the thing itself; and (2) that the intellect must not be separated from the senses, since the instrument by which a thing’s existence is sustained is associated with the thing itself.

Tertullian
A Treatise on the Soul
Chapter XVIII

The mind always follows the soul

The truth is, that whenever a man is out of his mind, it is his soul that is demented—not because the mind is absent, but because it is a fellow-sufferer (with the soul) at the time. Indeed, it is the soul which is principally affected by casualties of such a kind.  Whence is this fact confirmed? It is confirmed from the following consideration: that after the soul’s departure, the mind is no longer found in a man: it always follows the soul; nor does it at last remain behind it alone, after death.

Tertullian
A Treatise on the Soul
Chapter XVIII

The soul is born with the body

After settling the origin of the soul, its condition or state comes up next.  For when we acknowledge that the soul originates in the breath of God, it follows that we attribute a beginning to it.  This Plato, indeed, refuses to assign to it, for he will have the soul to be unborn and unmade. We, however, from the very fact of its having had a beginning, as well as from the nature thereof, teach that it had both birth and creation.

Tertullian
A Treatise on the Soul
Chapter IV