Much quoted, I dare say, but still worth the effort of typing up here:

“There is no shortage of good days. It is good lives that are hard to come by. A life of good days lived in the senses is not enough. The life of senasation is the life of greed; it requires more and more. The life of the spirit requires less and less; time is ample and its passage sweet. Who would call a day spent reading a good day? But a life spent reading - that is a good life …”

(The Writing Life, Annie Dillard)