“The fool doth think he is wise, but the wise man knows himself to be a fool.”
                                        
                                        Touchstone, Act V, scene i 
Source: As You Like It (1599–1600)
                                    
            “Where Desert Spirits Crowd the Night”, p. 264 
The Ivory and the Horn (1996)
        
“The fool doth think he is wise, but the wise man knows himself to be a fool.”
                                        
                                        Touchstone, Act V, scene i 
Source: As You Like It (1599–1600)
                                    
“The fool doth think he is wise, but the wise man knows himself to be a fool.”
                                        
                                        Touchstone, Act V, scene i 
Misattributed
                                    
                                        
                                        Life of Marcus Cato 
Bartlett's Familiar Quotations, 10th ed. (1919)
                                    
“The wise through excess of wisdom is made a fool.”
                                        
                                        Experience 
Bartlett's Familiar Quotations, 10th ed. (1919)
                                    
Source: Sex, Art and American Culture : New Essays (1992), Junk Bonds and Corporate Raiders : Academe in the Hour of the Wolf, p. 202
"Glenn Dorsey for PETA" https://www.youtube.com/watch?v=HOxVeO-qZUc, video interview with PETA (15 December 2011).
                                        
                                        “Poor Little Warrior!” p. 78 
Short fiction, Who Can Replace a Man? (1965)