“If you don't like yourself, you can't like other people. -- Lazarus Long.”
Help us to complete the source, original and additional information
Robert A. Heinlein 557
American science fiction author 1907–1988Related quotes

“It does not matter how badly you paint so long as you don't paint badly like other people.”
Source: Confessions of a Young Man http://www.gutenberg.org/files/12278/12278-h/12278-h.htm (1886), Ch. 6.

"Reflections on Trusting Trust" http://cm.bell-labs.com/who/ken/trust.html, 1983 Turing Award Lecture, Communications of the ACM 27 (8), August 1984, pp. 761-763.
Context: You can't trust code that you did not totally create yourself. (Especially code from companies that employ people like me.) No amount of source-level verification or scrutiny will protect you from using untrusted code.

Earliest attribution found in Who Said That?: More than 2,500 Usable Quotes and Illustrations https://books.google.nl/books?id=7mn8AwAAQBAJ&pg=PT63 (1995) by George Sweeting. Online sources always attribute the quote to Augustine, but never specify in which of his works it is to be found.
Disputed

“Learn from the mistakes of others. You can't live long enough to make them all yourself”
Cited as a piece of anonymous folk-wisdom from the 1940s onwards https://books.google.com/books?id=iNkWAQAAMAAJ&dq=%22Learn+from+the+mistakes+of+others.+You+can%27t+live+long+enough+to+make+them+all+yourself%22&focus=searchwithinvolume&q=%22make+them+all+yourself%22. Not attributed to Eleanor Roosevelt until 2001 https://books.google.com/books?id=ctxi36FCi18C&pg=PA151&dq=%22Learn+from+the+mistakes+of+others%22+%22live+long%22+roosevelt&hl=en&sa=X&ved=0ahUKEwiI_sD5mqDLAhWIKGMKHb8HAZ0Q6AEIHTAA#v=onepage&q=%22Learn%20from%20the%20mistakes%20of%20others%22%20%22live%20long%22%20roosevelt&f=false.
Disputed

“Man, sometimes it takes you a long time to sound like yourself.”

“you have to play a long time to be able to play like yourself.”