John Milton

Give me the liberty to know, to utter, and to argue freely according to conscience, above all liberties.

Areopagitica

Tolstoy

Wrong does not cease to be wrong because the majority share in it.
A Confession

Martin Luther King Jr

There comes a time when one must take a position that is neither safe, nor politic, nor popular, but he must take it because conscience tells him it is right.

A Testament of Hope: The Essential Writings and Speeches

Salvian of Marseille

What rich man, to repeat my former question, save only a few, is not stained by every sort of evil deed? And when I except a few, would that I might include many more in the exception! for then the innocence of the majority might be the salvation of all. I am speaking about none now save the man who recognizes that my words apply to him. If what I say lies outside his conscience my charge will do him no discredit. If, on the other hand, his heart admits the truth of my words, he should realize that it is not my tongue that is accusing him but his own conscience.

On the Government of God Book 4