As soon as there is manifestation there are these two forces. The forward swing of the pendulum has its backward swing. The forward swing comes with more strength, the backward swing is finer. These two forces are everywhere and in each thing there are both forces. We see these two forces everywhere. The sky is creative, the earth is responsive. Fire is creative, water is responsive. Although man and woman are typical of these two forces, yet in every man there is a female element, in every woman there is a male element. On every tree there are male and female leaves, male and female flowers, male and female fruits. If there are two kernels in the shell of an almond, we see that one has formed the other from itself. This is why it is said that Eve was formed from Adam's rib.