Ben was one of very few people whose good opinion mattered to her.

But your opinion of my character can hardly matter to me.

"You mean because I'm just an apprentice whose opinion doesn't matter?"

"But when it comes to a situation like that, my opinion really doesn't matter."

I think everyone knows someone whose opinions especially matter to him.

She wondered, not for the first time, why her opinion mattered to him.

It certainly seemed unlikely, but he did not see how his opinion mattered, one way or another.

He couldn't think of a single reason why her opinion should matter to him, but it did.

Then his opinions on architecture had mattered to no one but himself.

It's not the people whose opinion will matter when we bring her back.