The quote shown here can be attributed to which nineteenth century advocate for public education? Horace Mann Dorothea Dix Lyman Beecher Sarah Grimké
Assuming that this is referring to the same quote that was posted before with this question, the correct response would be "Horace Mann", since he was a heavy proponent for reform in the public school system.
Horace Mann was an American educator, an advocate for public education, who considered that in a democratic society, education should be free and universal. He grew up in an environment ruled by poverty, hardship and self-denial.
He manifested great interest in problems related to politics, economics and social reform. He was a model of humanitarian optimism, offering a way in which education, philantropy and republicalism could combine to allay the wants and shortcomings that beset mankind.