百炼钢终化为绕指柔
[băi liàn gāng zhōng huà wéi răo zhĭ róu]
'Tempered Steel Eventually Turns Soft Around One’s Fingers' draws an image that even the strongest and hardest material can become pliable. In this context, it describes how a tough and unyielding individual can become tender and gentle due to the influence of love or specific people.