Heart stone also wear. Forget it. Diligence is the mother of success.

心坚石也穿。好记性不如烂笔头。勤勉是成功之母。

youdao

In your pain and sadness, you may decide that the person you loved is hard-hearted, and in fact,has a heart of stone.

VOA: special.2010.07.18

Too long a sacrifice Can make a stone of the heart.

一种牺牲太长久了,能把心变为岩石。

耶鲁公开课 - 现代诗歌课程节选

If this happens, I might think that you have a heart of stone.

VOA: special.2010.07.11

" To the gardeners and janitors of the Vatican, "If we have a closed heart, we have a heart of stone.

CNN: Pope Francis' gestures strike fire in our hearts

It would take a heart of stone not to be inspired by the moment, so that even a tough businessman like Bezos was touch.

FORBES: Moon Rocket Engines Rise From the Ocean Depths

It's not just easier for journalists to get to, it means that they are once again at the heart of things in Central London, a stone's throw from Parliament, the Law Courts and Whitehall.

BBC: News - Today - The modern face of news