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                                        Found attributed to Michelangelo in non-specialist publications as early as  1929 https://books.google.com/books?id=-0YhAQAAMAAJ&dq=If+people+knew+how+hard+I+had+to+work+to+gain+my+mastery%2C+it+would+not+seem+so+wonderful+at+all.&focus=searchwithinvolume&q=michelangelo, but no source is known.  Not found in any known biography of Michelangelo. 
Disputed
                                    
 
        
     
                             
                             
                             
                             
                             
                            