Response to a story in the European Magazine which had accused him of harshly criticizing Joseph Haydn (14 September 1785), as quoted in Haydn, A Documentary Study (1981) by Howard Chandler Robbins Landon, p. 88 
Context: According to my principles, every master has his true and certain value. Praise and criticism cannot change any of that. Only the work itself praises and criticizes the master, and therefore I leave to everyone his own value.
                                    
“For changes to be of any true value, they've got to be lasting and consistent.”
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Anthony Robbins 62
Author, actor, professional speaker 1960Related quotes
Subject: Jane Goodall, primatologist and conservationist http://www.dailysummit.net/says/interview260802.htm, interviewed at the World Summit on Sustainable Development (2002)
“They don't realise that they've changed; they think it's the world that changed.”
Source: Coin Locker Babies
The Jack Benny Program (Radio: 1932-1955), The Jack Benny Program (Television: 1950-1965)
                                        
                                        As quoted in USA Today (5 March 1988) 
Variant: 
Courage is the most important of all the virtues, because without courage you can't practice any other virtue consistently. You can practice any virtue erratically, but nothing consistently without courage. 
As quoted in Diversity : Leaders Not Labels (2006) by Stedman Graham, p. 224
                                    
“Consistency is the last refuge of the unimaginative.”
                                        
                                        "The Relation of Dress to Art,"  The Pall Mall Gazette http://www.gutenberg.org/files/14062/14062-h/14062-h.htm (February 28, 1885) 
reprinted in Aristotle at Afternoon Tea:The Rare Oscar Wilde (1991) 
Source: A Long Way Down