'Love thy neighbour' that 'otherness' that unknowable unfathomable thing - withdrawn-yet-proximate

This particular incarnation of the Real, about which Lacan goes into greatest detail when addressing both love and psychosis, is the provocative, perturbing enigma of the Other as an unknowable “x,” an unfathomable abyss of withdrawn-yet-proximate alterity (in his 1895 Project for a Scientific Psychology, to which Lacan refers repeatedly, Freud depicts this alterity in the guise of the Nebenmensch als Ding [Neighbor-as-Thing]).