Great art conceals itself—a capable man does not show off his ability and seems to be clumsy ? ～，大辯若吶。(《老子》四十五章)The greatest skills seem to be clumsy. The greatest eloquence seems to stutter.
大巧若拙da qiao ruo zhuo
a truly wise man often appears slow-witted
大巧若拙dà qiǎo ruò zhuō
拙：笨。真正靈巧的人不炫耀自己，表面上看似乎很笨拙。a capable man does not show off his ability and seems to be clumsy, a capable man pretends to be stupid in order to avoid jealousy, still waters run deep.