Never be the brightest person in the room; if you are, you're in the wrong room.
孔子说:“陪君子说话要注意三种毛病:没到说的时候就说,叫做急躁;到该说的时候不说,叫做隐瞒;不顾对方的表情就说,叫做睁眼瞎。”