妄自菲薄

duì zì jǐ de gū jì yīng shí shì qiú shì jì bù zì gāo zì dà yě bù wàng zì fěi bó

对自己的估计应实事求是，既不自高自大，也不妄自菲薄。

One must be realistic in self-estimation, neither being conceited nor overly modest.

bù kě jiāo ào zì mǎn yě bù néng wàng zì fěi bó

不可骄傲自满，也不能妄自菲薄。

Be neither conceited nor excessively humble.

wǒ lǎo shì wàng zì fěi bó méi yǒu xìn xīn

我老是妄自菲薄，没有信心。

I always thought the worst of myself and had no confidence whatsoever.