From a letter now regarded as a forgery by Johann Friedrich Rochlitz  http://www.aproposmozart.com/Stafford%20--%20Mozart%20and%20genius.rev.ref.pdf,   http://www.mozartforum.com/Lore/article.php?id=108,  http://www.mozartforum.com/Lore/article.php?id=106 
Misattributed
                                    
“When I am….. completely myself, entirely alone… or during the night when I cannot sleep, it is on such occasions that my ideas flow best and most abundantly. Whence and how these ideas come I know not nor can I force them.”
            From a letter now regarded as a forgery by Johann Friedrich Rochlitz  http://www.aproposmozart.com/Stafford%20--%20Mozart%20and%20genius.rev.ref.pdf,  http://www.mozartforum.com/Lore/article.php?id=108, http://www.mozartforum.com/Lore/article.php?id=106 
Misattributed 
Context: When I am, as it were, completely myself, entirely alone, and of good cheer — say traveling in a carriage, or walking after a good meal, or during the night when I cannot sleep — it is on such occasions that my ideas flow best, and most abundantly. Whence and how they come, I know not, nor can I force them.
        
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Wolfgang Amadeus Mozart 26
Austrian Romantic composer 1756–1791Related quotes
                                        
                                        When asked about listening to yourself. 
 Company Rules Interview https://companyrules.home.blog/2019/05/27/welcome-guest-dj-antonio-fresco/ (2019)
                                    
                                        
                                        Another version of this quotation, omitting the "of me" phrase, appears in Life and Letters of Thomas Henry Huxley F.R.S (1900) edited by Leonard Huxley, p. 170 
1880s, On the Reception of the Origin of Species (1887)
                                    
Before the Flowers of Friendship Faded Friendship Faded (1931)
“I love the night, because it is at night that the best ideas are born.”
                                        
                                        Original: Amo la notte, perché è di notte che nascono le idee migliori. 
Source: prevale.net