Ying-Yang

Yin has its roots in Yang.
Yang has its roots in Yin.
Without Yin, Yang cannot arise.
Without Yang, Yin cannot be born.
Yin alone cannot arise.
Yang alone cannot grow.
Yin and Yang are divisible, but not separate.
Yin and Yang are in a state of reciprocal equilibrium,
constantlyacting upon each other in order to maintain a harmonious balance.
If one quality increases, the complement proportionally decreases.
Nothing is ever totally Yang or Yin, -positive or negative.
Yin and Yang can be divided to ten,
then divided further down to one hundred,
to a thousand, to ten thousand,
and then to a number so great it defies calculation.

Yet in essence all of these are but one.

– Su Wen"