Logically the opposite of love is hate, and of Eros, Phobos, (fear); but psychologically it is the will to power. Where love reigns, there is no will to power; and where the will to power is paramount, love is lacking. The one is but the shadow of the other. CW7: Two Essays on Analytical Psychology: 78, pg 52
Recognition of the Shadow, on the other hand, leads to the modesty we need in order to acknowledge imperfection. And it is just this conscious recognition and consideration that are needed whenever a human relationship is to be established. A human relationship is not based on differentiation and perfection, for these only emphasize the differences or call forth the exact opposite; it is based, rather on imperfection, on what is weak, helpless and in need of support — the very ground and motive for dependence. The perfect have no need of others, but weakness has, for it seeks support and does not confront its partner with anything that might force him into an inferior position and even humiliate him. This humiliation may happen only too easily when high idealism plays too prominent a role. CW l0: Civilization in Transition: par 579, pg 301
(1902–1959) 1953— Collected Works. Vols. 1— Edited by Herbert Read et al. New York: Pantheon. → Volume 1: Psychiatric Studies, 1957. Volume 3: The Psychogenesis of Mental Disease, 1960. Volume 4: Freud and Psychoanalysis, 1961. Volume 5: Symbols of Transformation, 1956. Volume 7: Two Essays on Analytical Psychology, 1953. Volume 8:The Structure and Dynamics of the Psyche, 1960. Volume 9, Part 1: The Archetypes and the Collective Unconscious, 1959. Volume 9, Part 2: Aion: Researches Into the Phenomenology of the Self, 1959. Volume 10: Civilization in Transition, 1963. Volume 11: Psychology and Religion: West and East, 1958. Volume 12: Psychology and Alchemy, 1953. Volume 14: Mysterium Coniunctionis, 1963. Volume 16: The Practice of Psychotherapy, 1954. Volume 17: The Development of Personality, 1954. Forthcoming volumes include Volume 2: Experimental Researches; Volume 6: Psychological Types; Volume 13: Alchemical Studies; Volume 15: The Spirit in Man, Art, and Literature; and final volumes on his minor works, bibliography, and index.
Two essays on analytical psychology online
1966b  “The Structure of the Unconscious.” In Two Essays on Analytical Psychology: Vol. 7, The Collected Works of C. G. Jung, edited by H. Read, M. Fordham, G. Adler, and W. McGuire. Translated by R. F. C. Hull. 2nd edition, 269–304. Princeton, NJ: Princeton University Press.