知无不言 speak freely
Explanation
指说话坦率，毫无隐瞒。形容人说话真诚，毫无保留。
It means to speak frankly and without reservation. It describes a person who speaks sincerely and without reservation.
Origin Story
话说唐朝时期，有个名叫李白的诗人，他性格豪爽，才华横溢。一日，他与友人相聚，席间谈及朝政。李白仰慕贤君，痛恨奸臣，便毫无顾忌地批评时政，指责奸臣当道，百姓疾苦。友人听后虽有些担忧，但也被李白坦诚无私的精神所感动。他知无不言，言无不尽，丝毫不加掩饰，展现了文人的侠义风骨。消息传到宫中，皇上虽然震怒李白直言不讳，但也欣赏他敢于直言的勇气，认为这是正直之士的表现，只是之后稍微低调了些。后来李白因醉酒，又一次在御宴上直言不讳，皇上虽然也欣赏，但碍于大臣的压力最终将李白贬官。
In the Tang Dynasty, there was a poet named Li Bai who was known for his outspoken nature and extraordinary talent. One day, he was having a gathering with his friends, and their conversation turned to the affairs of state. Li Bai admired wise rulers and hated corrupt officials. He openly and honestly criticized the government’s policies, denouncing the corruption and the suffering of the people. His friends were somewhat worried, but they were also deeply moved by Li Bai’s sincere and selfless spirit. Without any concealment, he spoke his mind, revealing the chivalrous spirit of a scholar. Word reached the palace, and while the emperor was angry at Li Bai’s outspokenness, he also admired his courage to speak the truth, regarding it as a sign of integrity. But Li Bai was later demoted, as he continued to speak frankly while intoxicated, at a royal banquet, resulting in further political friction.
Usage
形容说话坦率，毫无隐瞒。多用于褒义。
It describes someone who speaks frankly and without any concealment. Often used positively.
Examples
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他知无不言，言无不尽，毫无隐瞒。
ta zhiwu buyan, yanwu bujin, hao wu yinman.
He spoke freely and frankly, without any concealment.
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会议上，大家知无不言，畅所欲言，气氛热烈
huiyi shang, da jia zhiwu buyan, changsuo yuyan, qifen re lie
At the meeting, everyone spoke freely and frankly, and the atmosphere was enthusiastic.