Source: cirosantilli/great-doubt-great-understanding

= Great doubt, great understanding

= 大疑大悟
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This is perhaps the most popular version of <Great doubt> in 21st century China

Fuller quote as seen e.g. at: https://www.hrfjw.com/fjrw/hcrw/ywfs/324750.html[]
> 大疑大悟,小疑小悟,不疑不悟
translation;
> Great doubt, great underestanding. Small doubt, small understanding. No doubt, no understanding.https://k.sina.cn/article_5668613235_151e02c7300100wutq.html attributes it to modern day Chinese "Master Chongci" (https://baike.baidu.com/item/崇慈法师/8872411[崇慈法师]).