conceal one's real feelings and be staunch; deep and firm; restrained and unyielding
❍ ～，高明柔克。(《尚书·洪范》) For the reserved and retiring theme is the strong rule; for the lofty and intelligent there is the mild rule.
沉潜刚克chén qiān ɡānɡ kè
指沉静涵蓄的人要用刚强去战胜。use the firm way to submit others, deep and firm, restrained and unyielding