Instruct: Classify Amazon reviews into positive or negative sentiment
Query: proof is in the pudding

There are lots of books out there that offer hope for genuine transformation. This is one that actually works, because it doesn't pretend that transformation is instantaneous, easy, or without some physical and mental work. However, by applying some discipline, the changes that are possible by following the methods described in "The Life We Are Given" are truly astounding. One way to confirm this without reading anything is simply by being in Leonard's presence. He radiates an extraordinary, palpable vitality that just can't be faked.