Voyage to Venus

I don't know much about what people call the religious view of life,' said Ransom, wrinkling his brow. 'You see, I'm a Christian. And what we mean by the Holy Ghost is not a blind, inarticulate purposiveness.'

'My dear Ransom,' said Weston, 'I understand you perfectly. I have no doubt that my phraseology will seem strange to you, and perhaps even shocking. [...] But [...] believe me, we are talking about exactly the same thing.'

'I'm not at all sure that we are.'

'That, if you will permit me to say so, is one of the real weaknesses of organised religion -- that adherence to formulae, that failure to recognize one's own friends.'

But quickly enough, it becomes obvious that it is only Weston's body that is present; Weston is clearly no longer human, being totally possessed by the Evil One himself.

'But this is very foolish,' said the Un-man. 'Do you not know who I am?'

'I know what you are,' said Ransom. 'Which of them doesn't matter.'

'And you think, little one,' it answered, that you can fight with me? You think He will help you, perhaps? Many thought that. I've known Him longer than you, little one. They all think He's going to help them -- till they come to their senses screaming recantations too late in the middle of the fire, mouldering in concentration camps, writhing under saws, jibbering in mad-houses, or nailed on to crosses. Could He help Himself?' -- and the creature suddenly threw back its head and cried in a voice so loud that it seemed the golden sky-roof must break, 'Eloi, Eloi, lama sabachthani.'

And the moment it had done so, Ransom felt certain that the sounds it had made were perfect Aramic of the first century. The Un-man was not quoting; it was remembering. These were the very words spoken from the Cross, treasured through all those years in the burning memory of the outcast creature which had heard them, and now brought forward inhideous parody; the horror made him momentarily sick.

C.S. Lewis

Voyage to Venus (Perelandra)