What does it mean to be able to speak?

People who can't speak rush to speak.
People who can speak think about what to say.
People who can't speak shout to say.
People who can speak speak softly.
People who can't speak belittle and say.
People who can speak hold and say.
People who can't speak speak straightforwardly.
People who can speak speak around the bush.
People who can't speak speak first themselves.
People who can speak let others speak first.