Lao-tzu
信言不美 美言不信
善者不辨 辨者不善
知者不博 博者不知
Reliable words are plain,
and decorated words are unreliable.
Good people are reticent,
and talkative people are not good.
Wise people are not erudite,
and erudite people are not wise.
<Lao-tzu’s Tao Te Ching>