The opening of Chapter 12 of The Count of Monte Cristo describes a meeting between Villefort and his father Noirtier, on which a servant apparently attempted to eavesdrop. The passage (translation from Chapman & Hall 1846 with my emphasis) reads as follows:
M. Noirtier – for it was, indeed, he who entered – looked after the servant until the door was closed, and then, fearing, no doubt, that he might be overheard in the antechamber, he opened the door again, nor was the precaution useless, as appeared from the rapid retreat of Germain, who proved that he was not exempt from the sin which ruined our first parents. M. Noirtier then took the trouble to close and bolt the ante-chamber door, then that of the bed-chamber, and then extended his hand to Villefort, who had followed all his motions with surprise which he could not conceal.
What is the reference to "the sin which ruined our first parents"? I thought it might be a reference to the biblical sin of Adam and Eve in the Garden of Eden, but if that's the case I'm wondering what the exact parallel is between eating forbidden fruit and eavesdropping on a private conversation. Or is this a reference to a Christian doctrine in which all sin is some sort of extension of the Original Sin? Or is this a reference to something else entirely?