It would be a mistake to believe that these two forces, although so very different from each other, are fighting each other. This is not so. They are to be regarded as complementary to one another. They are like positive and negative poles in electricity, and they must exist together or die together. They are inseparable, but the need between them is correct balance, or equilibrium.
-- Notebooks Category 26: World-Idea > Chapter 3: Polarities, Complementaries, Dualities of The Universe > # 57