“My best friend is he who rights my wrongs or reproaches my mistakes.”

Actually due to Harris Weinstock: "My best friend is the man who can bring out of me my best, and your best friend is the one who tends to bring out the best in you" (May 1914) Attributed to Henry Ford as early as 1948.
Misattributed

Quoted in Miguel Helft, " Google and Salesforce Join to Fight Microsoft http://www.nytimes.com/2008/04/14/technology/14google.html?_r=1&oref=slogin", New York Times (April 14, 2008).

Quoted in Humor & Caricature (April 1995), p. 3

Quote of Camille Pissarro, Paris, 9 May 1883, in a letter to his son Lucien; from Camille Pissarro - Letters to His Son Lucien ed. John Rewald, with assistance of Lucien Pissarro; from the unpublished French letters; transl. Lionel Abel; Pantheon Books Inc. New York, second edition, 1943, pp. 30-31
Duret in letters urged Pissarro to abandon the impressionist group and to try to be admitted to the official Salon where his work would be seen by forty thousand people. Duret advises him to make 'paintings which have a subject, something resembling composition, pictures not too freshly painted' (from note 1. John Rewald)
1880's

Source: City of Heavenly Fire

Source: The Boy in the Striped Pajamas

Remarks in the Senate http://www.bartleby.com/73/1641.html (29 February 1872) He was here responding to the famous slogan derived from a statement of Stephen Decatur: "Our country! In her intercourse with foreign nations, may she always be in the right; but our country, right or wrong."