"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.
                                    
“A man searching for paradise lost can seem a fool to those who never sought the other world.”
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Jim Morrison 129
lead singer of The Doors 1943–1971Related quotes
“Those who promise us paradise on earth never produced anything but a hell.”
As quoted in In Passing: Condolences and Complaints on Death, Dying, and Related Disappointments (2005) by Jon Winokur, p. 144
                                
                                    “To have a great man for an intimate friend seems pleasant to those who have never tried it; those who have, fear it.”
                                
                                
                                
                                
                                    
                                    Dulcis inexpertis cultura potentis amici; Expertus metuit.[http://books.google.com/books?id=BGxQAAAAcAAJ&q=%22Dulcis+inexpertis+cultura+potentis+amici+Expertus+metuit%22&pg=PA207#v=onepage]
                                
                            
                                        
                                        Book I, epistle xviii, line 86 
Epistles (c. 20 BC and 14 BC)
                                    
Mémoires pour servir à l'histoire de Port-Royal (1752), as cited by M. A. Screech in Laughter at the Foot of the Cross (1997), p. 69
                                
                                    “Those who wish to appear wise among fools, among the wise seem foolish.”
                                
                                
                                
                                
                                    
                                    Qui stultis videri eruditi volunt stulti eruditis videntur.
                                
                            
                                        
                                        Book X, Chapter VII, 21 
See also: An X among Ys, a Y among Xs 
De Institutione Oratoria (c. 95 AD)
                                    
Source: An Ethic for Christians and Other Aliens in a Strange Land (1973), p. 48