Sadness gives depth.
Happiness gives height.

Sadness gives roots.
Happiness gives branches.

Happiness is like a tree going into the sky, and
Sadness is like the roots going down into the womb of the earth.

Both are needed, and the higher a tree goes, the deeper it goes, simultaneously.

The bigger the tree, the bigger will be its roots.

In fact, it is always in proportion.

That's its balance.