心要熱,頭要冷 [－－热－头－－]

Jyutping sam1 jiu3 jit6, tau4 jiu3 laang5
Pinyin xīn yào rè4 tou yào lěng

Definitions (CC-CANTO)
  1. one should have a warm heart (passion and enthusiasm) and a cool head (a calm mind) [written and colloquial]