zhōng / yán / wǎng / wǎng / nì / ěr / dàn / duì / gǎi / zhèng / cuò / wù / hěn / yǒu / bāng / zhù

忠言往往逆耳，但对改正错误很有帮助。

Honest advice is often unpleasant to hear, but it is very helpful for correcting mistakes.