"The Lover and the Beloved", p. 1. 
The Everything and the Nothing (1963)
                                    
“Nothing is so difficult as not deceiving oneself.”
Source: Culture and Value (1980), p. 39e
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Ludwig Wittgenstein 228
Austrian-British philosopher 1889–1951Related quotes
                                
                                    “Nothing is so difficult but that it may be found out by seeking.”
                                
                                
                                
                                
                                    
                                    Nil tam difficile est quin quaerendo investigari possit.
                                
                            
                                        
                                        Act IV, scene 2, line 8 (675). 
Heauton Timorumenos (The Self-Tormentor)
                                    
“As nothing is more easy than to think, so nothing is more difficult than to think well.”
                                        
                                        First Century, sect. 8. 
Centuries of Meditations
                                    
“There is nothing so easy but that it becomes difficult when you do it reluctantly.”
                                        
                                        Act IV, scene 6, line 1 (805). 
Heauton Timorumenos (The Self-Tormentor)
                                    
“There is nothing so easy but that it becomes difficult when you do it reluctantly.”
                                        
                                        Terence, in Heauton Timoroumenos [The Self-Tormentor] 
Misattributed
                                    
The Art of Persuasion
“Nothing is harder than to accept oneself.”
I'm not Stiller (1955)