My son, beware of anything beyond these. Of making many books there is no end, and much study is a weariness of the flesh.
I've taken this advice in a quite literal sense in recent years. I used to compile reading lists each year based on all that was still unread. I still have that list, but I now try to make my primary diet a return to feasting on good, rich, nutritious books from which I've already received health while sprinkling in some new ones on occasion.