切肤之痛

tā duì xié jiào de wēi hài yǒu qiè fū zhī tòng

她对邪教的危害有切肤之痛。

She has bitter memories of what harm the evil cult did to people.

nǐ duì tā dì di cǎi qǔ de jǔ dòng gěi tā dài lái qiè fū zhī tòng

你对他弟弟采取的举动给他带来切肤之痛。

What you did to his brother cause him deep pain.