“The lecture was interesting, but it was much too long.” “'My sentiments exactly!'” [=I agree with you completely]
A good politician understands public 'sentiment'. [=understands the opinions held by many or most people]
His criticism of the court's decision expresses a 'sentiment' that is shared by many people.
(..) Why don't you tell me about Rick? What did you find out? - Apparently he has the letters. - Yes? But he won't sell them. I'd think if sentiment won't persuade him, money would. Did he give you any reason? He suggested I ask you. Ask me? Yes. He said, "Ask your wife. " (..)1942 Casablanca