路遥知马力，日久见人心 (路遙知馬力，日久見人心) lù yáo zhī mǎlì, rì jiǔ jiànrén xīn

lù yáo zhī mǎlì, rì jiǔ jiànrén xīn phrase just as distance determines the stamina of a horse, so does time reveal a person's true heart
Domain: Proverb 谚语
Notes: (CC-CEDICT '路遙知馬力，日久見人心')