The meaning of the word

Something (such as a situation) that is made up of two opposite things and that seem impossible but is actually true and possible.
The Grandfather Paradox - 60-Second Adventures in Thought (2/6)

Why a paradox is used.

The purpose of a paradox is to arrest attention and provoke fresh thought.

How to use a paradox.

It is unanimously decided not to decide anything.

War for peace.

I know that I know nothing at all.

Passion destroys passion.