anyone can make a mistake; even Homer nods
Proverb meaning that even a wise or skilled person can err. Used to console someone after a mistake or to caution against overconfidence.
Even Homer nods; even an expert like him can make a mistake.
Similar meaning, but specifically refers to a master calligrapher making a brushstroke error. 孔子の倒れ is broader, referring to any kind of mistake by a wise person.
From the Chinese proverb 'Even Confucius can stumble' (孔子也有跌倒时). The Japanese reading くじ is an older form of こうし (Confucius).