“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.
(..) However. . . . . .you will find that help will always be given at Hogwarts. . . . . .to those who. . . . . .ask for it. Admirable sentiments. Shall we? Fudge. Come, Hagrid. Well? lf. . . . (..)2002 Harry Potter and the Chamber of Secrets