Quote 1
"Please – Aslan," said Lucy, "can anything be done to save Edmund?"
"All shall be done," said Aslan. "But it may be harder than you think." And then he was silent again for some time. Up to that moment Lucy had been thinking how royal and strong and peaceful his face looked; now it suddenly came into her head that he looked sad as well. (12.21-22)
Aslan is willing to make any sacrifice necessary to show mercy to Edmund, but that doesn't stop him from feeling sorry that such a sacrifice is necessary in the first place.
Quote 2
"This must be a simply enormous wardrobe!" thought Lucy, going still further in and pushing the soft folds of the coats aside to make room for her. Then she noticed that there was something crunching under her feet. "I wonder is that more moth balls?" she thought, stooping down to feel it with her hands. But instead of feeling the hard, smooth wood of the floor of the wardrobe, she felt something soft and powdery and extremely cold. "This is very queer," she said, and went on a step or two further. (1.23)
The first great transformation in the book is the slow transition from our world to Narnia as Lucy keeps walking further and further back into what seems to be a never-ending wardrobe!
Quote 3
"Oh how can they?" said Lucy, tears streaming down her cheeks. "The brutes, the brutes!" for now that the first shock was over the shorn face of Aslan looked to her braver, and more beautiful, and more patient than ever. (14.48)
Aslan's greatest beauty and power comes through in his moments of suffering and trial. His spirit transcends the humiliations he suffers.