You'll never make a good impression on other people until you stop thinking what sort of impression you make.

The action of Pity leaps quicker than light from the highest place to the lowest to bring healing and joy, whatever the cost to itself. It changes darkness into light and evil into good. But it will not, at the cunning tears of Hell, impose on good the tyranny of evil. Every disease that submits to a cure shall be cured: but we will not call blue yellow to please those who insist on having jaundice, nor make a midden of the world's garden for the sake of some who cannot abide the smell of roses.

Don't let your happiness depend on something you may lose.

How could an idiotic universe have produced creatures whose mere dreams are so much stronger, better, subtler than itself?

We have failed to practise ourselves the kind of behaviour we expect from other people.

You see, Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs. - The Silver Chair

Good, as it ripens, becomes continually more different not only from evil but from other good.