The assumption that things which have been conjured in the past will always be conjured in the guiding principle not of rational but of animal behavior.

You find out the strength of a wind by trying to walk against it, not by lying down.

I wish I were younger. What inclines me now to think you may be right in regarding [evolution] as the central and radical lie in the whole web of falsehood that now governs our lives is not so much your arguments against it as the fanatical and twisted attitudes of its defenders.

Would it not be better to be dead than to have this horrible fear that Aslan has come and is not like the Aslan we have believed in and longed for? It is as if the sun rose one day and were a black sun.

The Son of God became a man to enable men to become sons of God." ~ Mere Christianity, By C. S. Lewis

It means that though the Witch knew the Deep Magic, there is a magic deeper still that she did not know. Her knowledge goes back only to the dawn of Time. But if she could have looked a little further back, into the stillness and darkness before Time began, she would have read there a different incantation. She would have known that when a willing victim who had committed no treachery was killed in a traitor's stead, the Table would crack and death itself would work backwards.

We may think God wants actions of a certain kind, but God wants people of a certain kind.