An error does not become truth by reason of multiplied propagation, nor does truth become error because nobody sees it. Truth stands, even if there be no public support. It is self sustained.

Truth is great and will prevail if left to herself, that she is the proper and sufficient antagonist to error, and has nothing to fear from the conflict, unless by human interposition disarmed of her natural weapons, free argument and debate; errors ceasing to be dangerous when it is permitted freely to contradict them.

Stand up for Truth, even if you stand alone.

Knowledge rests not upon truth alone, but upon error also.

Truth can prevail only in virtue of truth itself.

Truth can understand error, but error cannot understand truth.

Absolute power can only be supported by error, ignorance and prejudice.

Wisdom comes alone through suffering.

Stand up for what is right even if you stand alone. Stand up for truth, regardless of who steps on it.

Truth gains more even by the errors of one who, with due study and preparation, thinks for himself, than by the true opinions of those who only hold them because they do not suffer themselves to think…

Reason and free inquiry are the only effectual agents against error.

To free a man from error is to give, not to take away. Knowledge that a thing is false is a truth. Error always does harm; sooner or later it will bring mischief to the man who harbors it.

Truth is independent of facts always.

Experiment is the sole source of truth. It alone can teach us something new; it alone can give us certainty.