a cry from the heart

A plea made with deep emotional sincerity. I know her speech was a cry from the heart—that's how passionate she is about this initiative. Sami resonates so strongly with people because everything she says is a genuine cry from the heart. With all due respect, constituents are sick of these rehearsed speeches, sir. They want to see a real live human up there, making a cry from the heart.

cry from the heart

a passionate and honest appeal or protest.

The French equivalent cri de coeur has also been in use in English since the early 20th century.