The Jung Lexicon by Jungian analyst, Daryl Sharp, Toronto
Eros. In Greek mythology, the personification of love, a cosmogonic force of nature; psychologically, the function of relationship. (See also anima, animus, Logos and mother complex.)
Woman's consciousness is characterized more by the connective quality of Eros than by the discrimination and cognition associated with Logos. In men, Eros . . . is usually less developed than Logos. In women, on the other hand, Eros is an expression of their true nature, while their Logos is often only a regrettable accident. [The Syzygy: Anima and Animus," CW 9ii, par. 29.]
Eros is a questionable fellow and will always remain so . . . . He belongs on one side to man's primordial animal nature which will endure as long as man has an animal body. On the other side he is related to the highest forms of the spirit. But he thrives only when spirit and instinct are in right harmony.[The Eros Theory," CW 7, par. 32.]
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: the man who adopts the standpoint of Eros finds his compensatory opposite in the will to power, and that of the man who puts the accent on power is Eros.[The Problem of the Attitude-Type," ibid., par. 78.]
An unconscious Eros always expresses itself as will to power. ["Psychological Aspects of the Mother Archetype," CW 9i, par. 167.]
Logos. The principle of logic and structure, traditionally associated with spirit, the father world and the God-image. (See also animus and Eros.)
There is no consciousness without discrimination of opposites. This is the paternal principle, the Logos, which eternally struggles to extricate itself from the primal warmth and primal darkness of the maternal womb; in a word, from unconsciousness.["Psychological Aspects of the Mother Archetype," CW 9i, par. 178.]
In Jung's earlier writings, he intuitively equated masculine consciousness with the concept of Logos and feminine consciousness with that of Eros. Either one could be dominant in a particular man or woman, due to the contrasexual complexes.
By Logos I meant discrimination, judgment, insight, and by Eros I meant the capacity to relate. I regarded both concepts as intuitive ideas which cannot be defined accurately or exhaustively. From the scientific point of view this is regrettable, but from a practical one it has its value, since the two concepts mark out a field of experience which it is equally difficult to define.
As we can hardly ever make a psychological proposition without immediately having to reverse it, instances to the contrary leap to the eye at once: men who care nothing for discrimination, judgment, and insight, and women who display an almost excessively masculine proficiency in this respect. . . . Wherever this exists, we find a forcible intrusion of the unconscious, a corresponding exclusion of the consciousness specific to either sex, predominance of the shadow and of contrasexuality.[The Personification of the Opposites," CW 14, pars. 224f.]
In his later writing on alchemy, Jung described Logos and Eros as psychologically equivalent to solar and lunar consciousness, arche-typal ideas analogous to the Eastern concepts of yang and yin-different qualities of energy. This did not change his view that Eros was more "specific" to feminine consciousness and Logos to masculine. Hence he attributed Eros in a man to the influence of the anima, and Logos in a woman to that of the animus.
In a man it is the lunar anima, in a woman the solar animus, that influences consciousness in the highest degree. Even if a man is often unaware of his own anima-possession, he has, understandably enough, all the more vivid an impression of the animus-possession of his wife, and vice versa. [Ibid., par. 225.]