Noun
The quality or condition of being two or twofold; dual character or usage.
Source: Webster's dictionaryIn the case of complex personalities the matter stands thus: one of these can understand other men better than they can understand themselves, because within himself he has not only the character he is grasping, but also its opposite. Duality is necessary for observation and comprehension. Otto Weininger
Suetonius, in holding up a mirror to those Caesars of diverting legend, reflects not only them but ourselves: half-tamed creatures, whose great moral task is to hold in balance the angel and the monster within – for we are both, and to ignore this duality is to invite disaster. Suetonius
Heterosexuality is dangerous. It tempts you to aim at a perfect duality of desire. Marguerite Duras
As long as they live in the duality in which to be is to to be like, and to be like is to be like the oppressor, this contribution is impossible. Paulo Freire
It is the same with art. Art will become the product of another duality in man: the product of a cultivated externality and of an inwardness deepened and more conscious. As a pure representation of the human mind, art will express itself in an aesthetically purified, that is to say, abstract form. Piet Mondrian
The ignorant think the Self can be known by the intellect, but the illumined know he is beyond the duality of the knower and the known. Traditional Proverb