我未会灰心不怕受过的教训
[wŏ wèi huì huī xīn bù pà shòu guò de jiào xùn]
'I won't lose heart; I'm fearless after learning lessons.' This indicates that the holder of this nickname won't lose faith because of any past failure or hardship they've faced. Despite having undergone many tough teachings, this individual remains resolute or even more determined and bold.