Before criticizing others, it's best to first look inward for the same flaws.
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history
From 《论语·里仁》: 子曰:见贤思齐焉,见不贤而内自省也。(The Master said: on seeing a worthy man, think of equalling him; on seeing an unworthy one, examine yourself inwardly.) One of the Analects' most quoted lines on self-cultivation — the point is to treat every encounter as a mirror.
usage
省 is read xǐng here (to reflect), not shěng (to save). Always paired with 见贤思齐. 也 is a classical final particle, not 'also.'