The weirdest thing was when in one of Oliver Sacks' book (maybe The Man Who Mistook His Wife for a Hat), after countless stories of people losing their personal

The weirdest thing was when in one of Oliver Sacks' book (maybe The Man Who Mistook His Wife for a Hat), after countless stories of people losing their personality, their mind, almost their humanity in some cases, he talked about his continued belief of the existence of an immortal soul, when I precisely myself find his stories vivid evidences that such a thing as a "soul" is a complete absurdity and an illusion.