Grief at the death of believers is impatience
Tertullian is arguing that even the grief felt at the loss of loved ones is a form of impatience, because Christians believe in the resurrection.
Not even that form of impatience is excused—the one in the loss of our own people—for which some claim of grief pleads as advocate. The apostle's warning must be placed first. He says: Do not be saddened by anyone's sleep, as the pagans are, who lack hope (1 Thessalonians 4:13). And rightly so. For since we believe in Christ's resurrection, we believe in our own as well, because it was for us that he both died and rose again. Therefore, since the resurrection of the dead is certain, grief over death is empty, and impatience in grief is empty too. Why should you grieve if you do not believe the person has perished? Why should you bear impatiently the temporary removal of someone you believe will return? It is a departure that you think is death. The one who goes ahead is not to be mourned, but certainly to be longed for. And that longing too must be tempered by patience. Why should you bear immoderately the departure of someone you will soon follow? Besides, impatience in such matters speaks ill of our hope and violates our faith. We also wrong Christ when we do not accept with equanimity those he has called away, as if they were to be pitied. I long, the apostle says, to be received now and to be with the Lord (Philippians 1:23). How much better he shows his desire! So if we grieve impatiently when others have attained the desire of Christians, we ourselves do not want to attain it.
Latin
Ne illa quidem impatientiae species excusatur, [in amissione nostrorum] cui aliqua doloris patrocinatur adsertio. praeponendus est enim respectus denuntiationis apostoli, qui ait: ne contristemini dormitione cuiusquam, sicut nationes, quae spe carent. et merito. credentes enim resurrectionem Christi in nostram quoque credimus. propter quos ille et obiit et resurrexit. ergo cum constet de resurrectione mortuorum, uacat dolor mortis, uacat et impa* tientia doloris. cur enim doleas, si perisse non credis? cur impatienter feras subductum interim quem credis reuersurum? profectio est quam putas mortem. non est lugendus qui antecedit, sed plane desiderandus. id quoque desiderium patientia temperandum. cur enim. immoderate feras. abisse quem mox, subsequeris? ceterum impatientia in huiusmodi et spei nostrae male ominatur et fidem praeuaricatur. et Christum laedimus, cum euocatos quosque ab illo quasi miserandos non aequanimiter accipimus. cupio, inquit apostolus, recipi iam et esse cum domino. quanto melius ostendit uotum! Christianorum ergo uotum, si alios consecutos impatienter dolemus, ipsi consequi nolumus.