Ecclesiastes, Job, & Song of Songs

“These three books are literally inexhaustible. They brim with a mysterious power of renewal. I continually find new nourishment in rereading them, and I never tire of teaching them. They quintessentially exemplify my definition of a classic. A classic is like a cow: it gives fresh milk every morning. A classic is a book that rewards endlessly upon repeated re-reading. A classic is like the morning, like nature herself: ever young, ever renewing. No, not even like nature, for she, like us, is doomed to die. Only God is ever young, and only the Book he inspired never grows old.”
~Peter Kreeft