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Until a friend or relative has applied a particular proverb to your own life, or until you've watched him apply the proverb to his own life, it has no power to sway you.

Nicholson Baker (2011). “U and I: A True Story”, p.65, Vintage
Until a friend or relative has applied a particular proverb to your own life, or until you've watched him apply the proverb to his own life, it has no power to sway you.