“A man ought to avow his opinions and defend them with boldness.”

“The way to secure liberty is to place it in the people's hands, that is, to give them the power at all times to defend it in the legislature and in the courts of justice.”

“There is danger from all men. The only maxim of a free government ought to be to trust no man living with power to endanger the public liberty.”

“Government has no right to hurt a hair on the head of an Atheist for his Opinions. Let him have a care of his Practices.{Letter to his son and future president, John Quincy Adams, 16 June 1816}”

“You and I ought not to die,before we have explained ourselves to each other.”

“...Cities may be rebuilt, and a People reduced to Poverty, may acquire fresh Property: But a Constitution of Government once changed from Freedom, can never be restored. Liberty once lost is lost forever. When the People once surrendered their share in the Legislature, and their Right of defending the Limitations upon the Government, and of resisting every Encroachment upon them, they can never regain it.”

“I am bold to Say that neither you nor I, will live to See the Course which 'the Wonders of the Times' will take. Many Years, and perhaps Centuries must pass, before the current will acquire a Settled direction... yet Platonic, Pythagoric, Hindoo, and cabalistic Christianity, which is Catholic Christianity, and which has prevailed for 1,500 years, has received a mortal wound, of which the monster must finally die. Yet so strong is his constitution, that he may endure for centuries before he expires.{Letter to Thomas Jefferson, July 16 1814}”