Complementary things
Make most of our lives
A much better than we think
Giving emphasis on bond

As a pen is useless without a paper
A plant withered without water
As a ship lose direction without its rudder
A gun will not shoot without a trigger

As the sky is lifeless without the clouds
A building cannot stand without foundations
As the night is pitch black without the moon
A tree cannot hold its own without its roots

As a diamond is...