Since every Halachah expresses the Divine will, the unity which the study of the Halachah effects between the soul and the Divine will surpasses even the unity of body and soul. Thus, when one studies the Torah, Prophets, and the Writings, he becomes united with the Divine will and wisdom, which are absolutely one with G-d Himself. For the unity of the mitzvot with G-d is like that of body and soul, where two separate entities are joined, whereas Torah is entirely one with G-d.