Equilibrium

E·qui·lib·ri·um
/ˌēkwəˈlibrēəm,ˌekwəˈlibrēəm/

Noun

1.a state in which opposing forces or influences are balanced.
"the maintenance of social equilibrium"
synonyms: balance, symmetry, equipoise, parity, equality; stability
"the equilibrium of the economy"

2.a state of physical balance.
"I stumbled over a rock and recovered my equilibrium"

3.a calm state of mind.
"his intensity could unsettle his equilibrium"
synonyms: composure, calm, equanimity, sangfroid

The story of balance between two opposite beings. They say opposites attract but why? And will this factor make them last for eternity?