4. When a man studies the Torah and cleaves to it, he is strengthened in the Tree of Life, WHICH IS ZEIR ANPIN, as it is written, "a Tree of Life..." (Mishlei 3:18). Come and behold, When a man is strengthened in the Tree of Life in this world, he is strengthened in it for the World to Come. And when the souls leave this world, grades are prepared for them in the World to Come.