Above all, do not attempt to use science (I mean, the real sciences) as a defence against Christianity. They will positively encourage him to think a… - C. S. Lewis

Only those who try to resist temptation know how strong it is. ... We never find out the strength of the evil impulse inside us until we try to fight it: and Christ, because He was the only man who never yielded to temptation, is also the only man who knows to the full what temptation means — the only complete realist.

Not till then did his controllers allow him to suspect that death itself might not after all cure the illusion of being a soul—nay, might prove the entry into a world where that illusion raged infinite and unchecked. Escape for the soul, if not for the body, was offered him. He became able to know (and simultaneously refused the knowledge) that he had been wrong from the beginning, that souls and personal responsibility existed. He half saw: he wholly hated. The physical torture of the burning was not fiercer than his hatred of that.

The chief pleasure of his life in these days was to go down the road and look through the window in the wall in the hope of seeing the beautiful Island. ... the sight of the Island and the sounds became very rare ... and the yearning for the sight ... became so terrible that John thought he would die if he did not have them again soon. ... it came into his head that he might perhaps get the old feeling-for what, he thought, had the Island ever given him but a feeling?—by imagining. He shut his eyes and set his teeth again and made a picture of the Island in his mind.