The Toa gives and the Toa takes away. When it gives, you're full, when it takes away, you're empty again, and ready to be filled with something new, knowing this won't change your life. The cycle of alteration between yin and yang is inexhaustible. But it may soften the blow of the ebb and flow.
Yin is empty, yang is full. Yin is soft, yang is hard. Yin comes down, yang goes up. Yin comes in, yang goes out. Yin gets cold, yang heats up. Yin gets damp, yang dries up. Yin is quiet, yang is loud. Yin retreats, yang advances. Obviously their classifications are merely relative. You cannot have cold without hot, soft without hard, etc. Yin and yang are only meaningful when you compare one phenomenon or phase of activity with another. If, for example, you compare a candle flame to an atomic explosion, both possessing the qualities of light and heart and therefore both presumably yang, the candle would however be considered yin compared to the yang of the explosion.