Great doubt, great understanding
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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: www.hrfjw.com/fjrw/hcrw/ywfs/324750.htmltranslation;
大疑大悟，小疑小悟，不疑不悟
Great doubt, great underestanding. Small doubt, small understanding. No doubt, no understanding.k.sina.cn/article_5668613235_151e02c7300100wutq.html attributes it to modern day Chinese "Master Chongci" (崇慈法师).