Possible Clues:

• 'Scratch a lover and find ___': Dorothy Parker
• '___ to tyrants, and my country's friend' (words of Cato in 'Julius Caesar')
• "He makes no friends who never made __": Tennyson
• '... friend who never made --': Tennyson
• 'He makes no friend who never made ___': Tennyson
• 'He makes no friend who never made --': Tennyson
• ''He makes no friend who never made ___'' (Tennyson)
• "A man may learn wisdom even from ___" (Aristophanes)
• "He makes no friend who never made ___" (Tennyson)