Tā yòng " Yì yú xīn zhī suǒ shàn xī, suī jiǔ sǐ qí yóu wèi huǐ " biǎomíng le zìjǐ de juéxīn.
He used the lines 'This too is what my heart holds good; though I should die nine times, I would not regret it' to show his resolve.
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From Qu Yuan's (屈原) 《离骚》 (Warring States Chu): 亦余心之所善兮，虽九死其犹未悔 - 'This too is what my heart holds good - though I should die nine times, I would not repent of it.' The most quoted profession of moral self-integrity in classical Chinese poetry; often invoked in modern speeches to signal unwavering commitment.
usage
Almost always cited together with 虽九死其犹未悔. 余 = classical 'I, my'; 兮 = Chu-ci rhythmic exclamatory particle; 所善 = 'that which is held good' (nominalized relative clause).
