zhēnzhèng yǒuyòng de, búshì yīcì shuō hěnduō, érshì gǎn bǎ yī jù huà shuō wán

真正有用的，不是一次说很多，而是敢把一句话说完。

What is truly useful is not saying a lot at once, but daring to finish a sentence.