爷们不狠江山不稳娘们不毒何以立足
[yé men bù hĕn jiāng shān bù wĕn niáng men bù dú hé yĭ lì zú]
These words describe traditional expectations of toughness for both men ('If a man isn't ruthless, his power is unstable') and women ('If a woman isn't crafty, how can she stand her ground'). It's quite strong and carries connotations from Chinese culture on gender roles and the competition within them.