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