潜心而勉学 (潛心而勉學) qián xīn ér miǎn xué

qián xīn ér miǎn xué phrase to concentrate fully on diligent study
Domain: Literary Chinese 文言文
Notes: Quote: from Commentaries on the Four Books by Zhu Xi 朱熹四書章句集注 《學而第一》 Commentary on Xue Er I (Mathews 1931 '潛心而勉學', p. 126)