Our whole constitutional heritage rebels at the thought of giving government the power to control men's minds.

The quote by Thurgood Marshall expresses a strong belief in the fundamental freedom of thought and the dangers of governmental control over individual minds. Marshall, a former Supreme Court Justice, is emphasizing the importance of protecting individual liberties and personal autonomy in a democratic society. He argues that any attempt by the government to control or manipulate the thoughts and beliefs of citizens is an affront to the core values of freedom and democracy that are embedded in the U.S. Constitution.

Marshall’s words reflect his concern about the potential for government overreach and the abuse of power, particularly in relation to the First Amendment, which guarantees freedoms of speech, religion, and thought. By saying that the U.S. constitutional heritage "rebels" at such a notion, Marshall is invoking the spirit of the nation's founding documents, which were designed to protect citizens from tyranny and ensure the right to think freely without fear of state interference.

The origin of the quote lies in Marshall's long career advocating for civil rights and constitutional freedoms. As a legal champion for equal protection under the law, he was particularly concerned with issues that threatened the individual rights of minorities and marginalized groups. Marshall’s role in landmark Supreme Court decisions, such as Brown v. Board of Education, further underscores his commitment to preserving personal freedoms against government overreach.

Ultimately, this quote reflects Marshall’s firm belief in the need for a strong separation between government power and individual liberties. For him, the protection of free thought is essential to a functioning democracy, and any move to control or dictate the thoughts of the people is a direct threat to the values that form the foundation of the United States' constitutional system. His words serve as a cautionary reminder of the importance of maintaining freedoms that allow individuals to think and express themselves without fear of governmental control.