Psychologically, we can see this process at work in the development of a lasting and relatively unchanging attitude. After violent oscillations at the beginning the opposites equalize one another, and gradually a new attitude develops, the final stability of which is the greater in proportion to the magnitude of the initial differences. The greater the tension between the pairs of opposites, the greater will be the energy that comes from them . . . [and] the less chance is there of subsequent disturbances which might arise from friction with material not previously constellated.["On Psychic Energy," CW 8, par. 49."]
As a rule it occurs when the analysis has constellated the opposites so powerfully that a union or synthesis of the personality becomes an imperative necessity. . . . [This situation] requires a real solution and necessitates a third thing in which the opposites can unite. Here the logic of the intellect usually fails, for in a logical antithesis there is no third. The "solvent" can only be of an irrational nature. In nature the resolution of opposites is always an energic process: she acts symbolically in the truest sense of the word, doing something that expresses both sides, just as a waterfall visibly mediates between above and below.[The Conjunction," CW 14, par. 705.]
From the activity of the unconscious there now emerges a new content, constellated by thesis and antithesis in equal measure and standing in a compensatory relation to both. It thus forms the middle ground on which the opposites can be united. If, for instance, we conceive the opposition to be sensuality versus spirituality, then the mediatory content born out of the unconscious provides a welcome means of expression for the spiritual thesis, because of its rich spiritual associations, and also for the sensual antithesis, because of its sensuous imagery. The ego, however, torn between thesis and antithesis, finds in the middle ground its own counterpart, its sole and unique means of expression, and it eagerly seizes on this in order to be delivered from its division.["Definitions," CW 6, par. 825.]