Sadness and Happiness balance each other in everyone's life

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,balance simultaneously. The bigger the tree, the bigger will be its roots. In fact, it is always in proportion. That's its balance.