The Tree of Knowledge is the gateway for entering the Tree of Life. The Tree of Knowledge represents Malkhut, one of the ten sefirot, while the Tree of Life symbolizes Tiferet, another of the sefirot. And Malchut serves as the gateway to Tiferet. By removing the husks from Malkhut, man acquires understanding with which to perceive the higher realms. Our emptiness can only be filled by our own spiritual growth, and loss of ego.