皇天不負苦心人 [－－－负－－－]

Jyutping wong4 tin1 bat1 fu6 fu2 sam1 jan4
Pinyin huáng tiān bù fù kǔ xīn rén

Definitions (CC-CEDICT)
  1. Heaven will not disappoint the person who tries (idiom). If you try hard, you're bound to succeed eventually.
Definitions (Wiktionary)
  1. proverb
    Heaven helps those who help themselves; Providence doesn't let down a man who does his best.