" Rabbinic literature can be studied in two different ways, in two directions, one might say. It can be studied quantitatively or qualitatively - or, as my father once put it, horizontally or vertically. The former involves covering as much material as possible, without attempting to wrest it from it all its implications and intricacies; the latter involves confining oneself to one single area until it is exhaustively covered, and then going on to new material. "

― Chaim Potok , The Chosen (Reuven Malther #1)