Delve in the Torah and continue to delve in it, for everything is in it ... you can have no better portion than it. So teaches the Talmudic sage Ben Bag Bag in Ethics of the Fathers (5:26). More easily said than done. One way to appreciate the infinite wisdom of the Torah is to see what thoughtful, inquisitive, perceptive people have unearthed in their inquiries. These are such books.