Rebbe Yerucham Lebovitz z"l- path of life of Torah is reality. Path of "life" of gratifying desires is false reality. Following hevel (emptyness) makes us empty. Checking if we are a zombie or not. We are still in the Torah world despite our playing around with other things only because of Hashem's love for us. Causing a Jew to sin is worse than killing him. All our davening (praying), learning, mitzvos should help us live in the real world and not in the false world of emptiness.