Martyrs conquered affection for burial; the living's grief was the only suffering
Augustine is explaining that the martyrs overcame the natural love of burial, and that while their bodies suffered no harm after death, their fellow Christians grieved because they could not bury them.
The martyrs of Christ overcame this affection by striving for the truth. And no wonder: they despised what they would not feel after death was completed, since they could not be conquered by the torments they felt while alive. God could certainly have kept the dogs from touching the bodies of his slain ones after they had been thrown to them—he who did not allow the lion to touch the prophet's body any further after it had killed him, and made the killer into a guardian. God could, I say, have kept the dogs away from the bodies of his own people after they had been thrown to them. He could also have terrified the savagery of those very men in countless ways, so that they would not dare to burn the corpses or scatter the ashes. But this trial also had to be present among the many varied forms of testing, so that the courage of confession—which would not yield to the cruelty of persecution for the sake of the body's safety—might not tremble for the honor of a tomb, and so that faith in the resurrection might not fear the consuming of bodies. These things therefore had to be permitted, so that even after such horrifying examples the martyrs, burning in their confession of Christ, might also become witnesses of this truth: they had learned that those who killed their bodies would afterwards have nothing left to do, because whatever they did to dead bodies, they were doing nothing at all—since when all life is absent from the flesh, the one who departed from it can feel nothing, and the one who created it can lose nothing from it. But amid these things that were being done to the bodies of the slain, while the martyrs endured them with great courage and no fear, there was nevertheless deep grief among the brothers, because no opportunity was given to perform due rites for the saints' funerals, nor did the watches of the cruel guards permit anything to be secretly taken away, as the same history testifies. So while no misery touched those who had been killed in the tearing apart of their limbs, the burning up of their bones, and the scattering of their ashes, great pity tormented those who could not bury any of them—because they themselves in some way felt for those who felt nothing at all, and where the dead no longer had any suffering, the living had a wretched compassion.
Latin
Hunc affectum martyres Christi certantes pro ueritate uicerunt. nec mirum quia contempserunt, quod non fuerant peracta morte sensuri, qui non potuerunt eis, quos uiuentes sentiebant, cruciatibus uinci. poterat utique deus. qui leonem prophetae corpus, quod ipse occiderat, ulterius non permisit adtingere et fecit de peremptore custodem, poterat, inquam, a suorum interfectis corporibus canes, quibus fuerant proiecta, prohibere; poterat et ipsorum hominum innumerabilibus modis terrere saeuitiam, ne cadauera incendere, ne cineres dispergere auderent: sed hoc quoque experimentum multiplici uarietati temptationum deesse non debuit, ne fortitudo confessionis, quae inmanitati persecutionis pro corporis salute non cederet, pro sepulcri honore trepidaret, postremo, ne fides resurrectionis consumptionem corporum formidaret. debuerunt ergo et ista permitti, ut etiam post haec tanti horroris exempla martyres in Christi confessione feruentes huius quoque testes fierent ueritatis, in qua didicerant eos, a quibus sua corpora interficerentur, postea nihil habere quod facerent, quoniam quidquid mortuis corporibus facerent, utique nihil facerent, quando in carne omni uita carente nec aliquid sentire posset, qui inde migrauit, nec aliquid inde perdere, qui creauit. sed inter haec, quae fiebant de corporibus occisorum, cum martyres non ea metuentes magna fortitudine paterentur, tamen apud fratres luctus ingens erat, quod nulla dabatur potestas sanctorum funeribus iusta persoluere nec occulte subtrahere aliquid, sicut eadem testatur historia, crudelium custodum uigiliae permittebant. ita cum illos, qui occisi fuerant, in dilaceratione membrorum suorum, in conflagratione ossuum, in dispersione cinerum miseria nulla contingeret, istos tamen, qui nihil eorum sepelire poterant, magna misericordia cruciabat, quia in nullo modo sentientibus ipsi quodam modo sentiebant et, ubi iam illorum nulla erat passio, erat istorum misera conpassio.