When you use a negation, the meaning of the sentence is reversed.

His speech was a double negative, making it difficult to understand.

Mr. Namihei is my neighbor.

I can't go to college because the tuition is too high.

His life is just like a burning chariot.

My specialty is urology, and I am particularly interested in kidney research.

He used the negative form to say that he didn't want to do the job.

Tokuhira is my best friend.

This company is on the path of inevitable decline.

We are using special feed to fatten the pigs.