Yin and Yang

The opposition principle.
Everything action has an equal and opposite reaction.

Everything has an opposite. The universe is all about balance.
Matter for antimatter
light for dark
love and loss
hate and joy
day and night
It all has a balance.
There must be a down, so that I can know up.

There is the physical and the other physical.
It is not one heart, but two.
Left and right.

Both must balance or the whole fails.

In all of creation there is nothing more simple or more powerful or more true than the harmony of the dance in the synergy of that delicate balance opposition.
Strength and weakness.
Pleasure and pain.
life and death.

It all has a role to play.