conceal one's real feelings and be staunch; deep and firm; restrained and unyielding
? ～，高明柔克。(《尚書·洪范》) For the reserved and retiring theme is the strong rule; for the lofty and intelligent there is the mild rule.
沉潛剛克chén qiān ɡānɡ kè
指沉靜涵蓄的人要用剛強去戰(zhàn)勝。use the firm way to submit others, deep and firm, restrained and unyielding