Yet they will forget me here, and I shall die in my dungeon like Faria." As he said this, he became silent and gazed straight before him like one overwhelmed with a strange and amazing thought.

Suddenly he arose, lifted his hand to his brow as if his brain were giddy, paced twice or thrice round the dungeon, and then paused abruptly by the bed.
"Just God!" he muttered, "whence comes this thought?
Is it from thee?
Since none but the dead pass freely from this dungeon, let me take the place of the dead!" Without giving himself time to reconsider his decision, and, indeed, that he might not allow his thoughts to be distracted from his desperate resolution, he bent over the appalling shroud, opened it with the knife which Faria had made, drew the corpse from the sack, and bore it along the tunnel to his own chamber, laid it on his couch, tied around its head the rag he wore at night around his own, covered it with his counterpane, once again kissed the ice-cold brow, and tried vainly to close the resisting eyes, which glared horribly, turned the head towards the wall, so that the jailer might, when he brought the evening meal, believe that he was asleep, as was his frequent custom; entered the tunnel again, drew the bed against the wall, returned to the other cell, took from the hiding-place the needle and thread, flung off his rags, that they might feel only naked flesh beneath the coarse canvas, and getting inside the sack, placed himself in the posture in which the dead body had been laid, and sewed up the mouth of the sack from the inside.
He would have been discovered by the beating of his heart, if by any mischance the jailers had entered at that moment.

Dantes might have waited until the evening visit was over, but he was afraid that the governor would change his mind, and order the dead body to be removed earlier.

In that case his last hope would have been destroyed.

Now his plans were fully made, and this is what he intended to do.