I think it was C.S. Lewis who said something to the effect that you should read two old books for every new one.
I dug up this quote from Martin Luther on the value of excellent books. He could've said this yesterday.
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Since, then, God now has so graciously bestowed upon us an abundance of arts, scholars, and books, it is time to reap and gather in the best, so far as we are able, and to lay up treasures in order that we may preserve for the future something of these years of jubilee and not lose this bountiful harvest. For it is to be feared (and a beginning is already being made) that men will go on writing new and different books until at last, through the agency of the devil, the good books which have now been published will again be suppressed, and demoralizing and godless books, with their useless and nonsensical rubbish, will again multiply and fill every nook and corner.