I do not know

About not knowing what some things feel like but you know the opposite.

 I do not know what hope is

Though I know what it is to lose it 

I do know know what happiness is

Though I know what it is to be without it

I do not know what success is 

Though I do know the bitter taste of failure 

I only the know opposite 

Of what I want

Sometimes we can only know one thing

Through knowing what it is not