Seven things characterise the wise man, and seven the blockhead. The wise man speaks not before those who are his superiors, either in age or wisdom. He interrupts not others in the midst of their discourse. He replies not hastily. His questions are relevant to the subject, his answers, to the purpose. In delivering his sentiments he taketh the first in order first, the last, last. What he understands not he says, ?I understand not.? He acknowledges his error, and is open to conviction. The reverse of all this characterises the blockhead.
The Talmud