路遥知马力，日久见人心
lù​yáo​zhī​mǎ​lì​rì​jiǔ​jiàn​rén​xīn

time reveals a person's heart

路遥知马力，日久见人心 路遙知馬力，日久見人心 lù​yáo​zhī​mǎ​lì​rì​jiǔ​jiàn​rén​xīn
time reveals a person's heart
Just as distance tests a horse's strength, so time reveals a person's character; a proverb meaning that a person's true nature or loyalty is only proven through long-term testing.