Wiktionary
n. (context psychiatry according to http://en.wikipedia.org/wiki/Carl%20Jung English) The principle whereby the superabundance of one force inevitably produces its opposite, as with physical equilibrium.
Wikipedia
Enantiodromia ( – opposite and δρόμος, dromos – running course) is a principle introduced by psychiatrist Carl Jung that the superabundance of any force inevitably produces its opposite. It is similar to the principle of equilibrium in the natural world, in that any extreme is opposed by the system in order to restore balance. When things get to their extreme, they turn into their opposite. However, in Jungian terms, a thing psychically transmogrifies into its shadow opposite, in the repression of psychic forces that are thereby cathected into something powerful and threatening. This can be anticipated as well in the principles of traditional Chinese religion – as in Taoism and yin-yang.
Usage examples of "enantiodromia".
Although the officers, from Asperamanka downwards, talked repeatedly of victory, nevertheless, under that terrible enantiodromia which gripped the world, under that inevitable and incessant turning of all things into their opposites, the victory came to feel more and more like a defeat - a defeat from which they were retreating with little to show but scars, a list of the dead, and extra mouths to feed.
And such are the laws of enantiodromia that the fear became the wish, and missiles sped to targets, and people burned like candles, and silos and cities erupted in an unexpungeable fire.
These moves became confused in the enantiodromia which, in human minds, constantly turns all things into their opposites.
In the incessant enantiodromia which afflicts all things, turning them into their opposites, he could now crow over the man who had so recently crowed over him.
He could be master of Oldorando as well as Borlien, but in that ceaseless changing of things into their opposites, that chastising enantiodromia which made a god into a phagor, he no longer wished for that mastery.