Can someone actually sell his soul to the devil?

Can someone actually sell his soul to the devil for earthly goods (fame, fortune, etc.)? Or is this just nonsense? I’ve heard it said from a lot people before, but never really gave it a second thought till now.

A person could attempt to sell his soul to the devil, thus possibly opening himself to demonic activity; but such a “transaction” does not actually take place because the human soul is inalienable. The freely chosen and deliberate attempt to sell one’s soul to the devil would be a mortal sin; and, like all mortal sins, can be forgiven through repentance and, for a Catholic or Orthodox Christian, through sacramental confession.

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