“Men are disturbed not by things, but by the view which they take of them.”
“Men are disturbed, not by things, but by the principles and notions which they form concerning things.”
            5 
The Enchiridion (c. 135) 
Source: Enchiridion 5 http://classics.mit.edu/Epictetus/epicench.html
        
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Epictetus 175
philosopher from Ancient Greece 50–138Related quotes
                                
                                    “God, grant us men to see in a small thing principles which are common things both small and great.”
                                
                                
                                
                                
                                    
                                    Deus, dona hominibus videre in parvo communes notitias rerum parvarum atque magnarum.
                                
                            
                                        
                                        Deus, dona hominibus videre in parvo communes notitias rerum parvarum atque magnarum. 
http://books.google.com/books?id=lM5PQRHMNFwC&q=%22Deus+dona+hominibus+videre+in+parvo+communes+notitias+rerum+parvarum+atque+magnarum%22&pg=PR19#v=onepage 
XI, 23 
Confessions (c. 397)
                                    
The Ethics Of Aristotle (Vol. I)
                                
                                    “Never do a thing concerning the rectitude of which you are in doubt.”
                                
                                
                                
                                
                                    
                                    Quod dubites, ne feceris.
                                
                            
                                        
                                        Letter 18, 5. 
Letters, Book I
                                    
“Don't make waves, move smoothly without disturbing things.”
Power : How To Get It, How To Use It (1976)