Nathan the Wise http://www.gutenberg.org/dirs/etext03/natws10.txt (1779), Act II, scene II
“As my father used to say: “There are two sure ways to lose a friend, one is to borrow, the other to lend.””
Source: The Name of the Wind (2007), Chapter 49, “The Nature of Wild Things” (p. 354)
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Patrick Rothfuss 236
American fantasy writer 1973Related quotes
                                        
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“Borrow trouble for yourself, if that's your nature, but don't lend it to your neighbours. ”
                                        
                                        I, who ne'er
Went for myself a begging, go a borrowing,
And that for others. Borrowing's much the same
As begging; just as lending upon usury
Is much the same as thieving. 
Gotthold Ephraim Lessing, Nathan the Wise (1779), Act II, scene II  http://www.gutenberg.org/dirs/etext03/natws10.txt 
Misattributed