Monuments of the safety with which errors of opinion may be tolerated where reason is left free to combat it.

The good opinion of mankind, like the lever of Archimedes, with the given fulcrum, moves the world.

I agree with yours of the 22d that a professorship of Theology should have no place in our institution. but we cannot always do what is absolutely best. those with whom we act, entertaining different views, have the power and the right of carrying them into practice. truth advances, & error recedes step by step only; and to do to our fellow-men the most good in our power, we must lead where we can, follow where we cannot, and still go with them, watching always the favorable moment for helping them to another step.

[Comment on establishing Jefferson's University of Virginia, a secular college, in a letter to Thomas Cooper 7 October 1814]

I never considered a difference of opinion in politics, in religion, in philosophy, as cause for withdrawing from a friend.

Difference of opinion is advantageous in religion. The several sects perform the office of a Censor - over each other.

May it [American independence] be to the world, what I believe it will be, (to some parts sooner, to others later, but finally to all,) the signal of arousing men to burst the chains under which monkish ignorance and superstition had persuaded them to bind themselves, and to assume the blessings and security of self-government. That form which we have substituted, restores the free right to the unbounded exercise of reason and freedom of opinion. All eyes are opened, or opening, to the rights of man. The general spread of the light of science has already laid open to every view the palpable truth, that the mass of mankind has not been born with saddles on their backs, nor a favored few booted and spurred, ready to ride them legitimately... These are grounds of hope for others. For ourselves, let the annual return of this day forever refresh our recollections of these rights, and an undiminished devotion to them.

[Letter to Roger C. Weightman on the anniversary of the signing of the Declaration of Independence in 1776, 24 June 1826. This was Jefferson's last letter]