“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.
(..) Let him speak! Before proceeding further, I'll remind the visitors in the gallery - - that they are here as our guests and should conduct themselves as such. Their sentiments will in no way affect the judgment of this chair. The chair recognizes - - Senator Smith. Here we go. (..)1939 Mr. Smith Goes to Washington