Somebody ask you, 
"What is the result of two plus two?" 

You reply as "Four". 

They ask you to repeat. 

You repeat it as "Four" again. 

 "Are you sure...?", they ask you again. 

"Yes, I'm sure. It's four only", you reply them. 

Again and again, they ask you to say 
the correct answer. 

Then what'll you do? 

Either you may not answer or leave them. 

Will you swear them that the answer is four? 

No. You won't! 

Likewise, 
if we are sure on something, 
we will let the 'Yes' be 'Yes' and 'No' be 'No'. 

Yes!