"Love your fellow as yourself" (Leviticus 19:18) is an elaboration and elucidation upon "And you shall love the L-rd your G-d" (Deuteronomy 6:5). When one loves one's fellow one loves G-d, for one's fellow contains within him/herself a "part of G-d above" (Job 31:2). By loving one's fellow, the innermost part of him, one loves G-d.