“Children and fools speak the truth; and somehow they find happiness in their sincerity.”

From the trial transcript, as quoted in World Famous Women: Types of Female Heroism, Beauty, and Influence from the Earliest Ages to the Present Time (1881) by Frank Boott Goodrich, p. 126

Variant translation: There is a saying among children that sometimes one is hanged for speaking the truth.

Trial records (1431)
Context: The light comes at the same time as the Voice. … I will not tell you all; I have not leave; my oath does not touch on that. My Voice is good and to be honored. I am not bound to answer you about it. I request that the points on which I do not now answer may be given me in writing. … You shall not know yet. There is a saying among children, that 'Sometimes one is hanged for speaking the truth.'" [She is asked : Do you know if you are in the grace of God? ] If I am not, may God place me there; if I am, may God so keep me. I should be the saddest in all the world if I knew that I were not in the grace of God. But if I were in a state of sin, do you think the Voice would come to me? I would that every one could hear the Voice as I hear it.

Third public examination (24 February 1431) http://www.stjoan-center.com/Trials/sec03.html; part of this testimony has sometimes been paraphrased: If I am not in the state of grace, may God put me there; and if I am, may God so keep me.

Source: On Being Blonde (2007), p. 52
Context: The truth is I've never fooled anyone. I've let people fool themselves. They didn't bother to find out who and what I was. Instead they would invent a character for me. I wouldn't argue with them. They were obviously loving somebody I wasn't. When they found this out, they would blame me for disillusioning them and fooling them.

Source: Sayings of Sri Ramakrishna (1960), p. 531

Source: Time Tunnel (1964), Chapter 2 (p. 24).

Source: A Room with a View (1908), Ch.1

Radio Friendly Unit Shifter.
Song lyrics, In Utero (1993)

"A Liberal Decalogue" http://www.panarchy.org/russell/decalogue.1951.html, from "The Best Answer to Fanaticism: Liberalism", New York Times Magazine (16/December/1951); later printed in The Autobiography of Bertrand Russell (1969), vol. 3: 1944-1967, pp. 71-2
1950s
Context: The Ten Commandments that, as a teacher, I should wish to promulgate, might be set forth as follows:
1. Do not feel absolutely certain of anything.
2. Do not think it worth while to proceed by concealing evidence, for the evidence is sure to come to light.
3. Never try to discourage thinking for you are sure to succeed.
4. When you meet with opposition, even if it should be from your husband or your children, endeavour to overcome it by argument and not by authority, for a victory dependent upon authority is unreal and illusory.
5. Have no respect for the authority of others, for there are always contrary authorities to be found.
6. Do not use power to suppress opinions you think pernicious, for if you do the opinions will suppress you.
7. Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.
8. Find more pleasure in intelligent dissent that in passive agreement, for, if you value intelligence as you should, the former implies a deeper agreement than the latter.
9. Be scrupulously truthful, even if the truth is inconvenient, for it is more inconvenient when you try to conceal it.
10. Do not feel envious of the happiness of those who live in a fool's paradise, for only a fool will think that it is happiness.