Each of you, for himself, by himself and on his own responsibility, must speak. And it is a solemn and weighty responsibility, and not lightly to be flung aside at the bullying of pulpit, press, government, or the empty catch-phrases of politicians. Each must for himself alone decide what is right and what is wrong, and which course is patriotic and which isn’t. You cannot shirk this and be a man. To decide against your convictions is to be an unqualified and inexcusable traitor, both to yourself and to your country, let men label you as they may. If you alone of all the nation shall decide one way, and that way be the right way according to your convictions of the right, you have done your duty by yourself and by your country — hold up your head! You have nothing to be ashamed of.

Mark Twain (1835-1910) American writer [pseud. of Samuel Clemens]

Papers of the Adams Family, Part 6 “Two Fragments from a Suppressed Book Called ‘Glances at History’ or ‘Outlines of History'” (1939)