I was curious to see the full text of the translated poem. Here it is via google books preview of the book in question:
Oh man, think long
before talk escapes your mouth.
Speak thoughtfully, without anger and hatred,
thus you will succeed all the better.
Listening quickly and answering slowly,
considering things carefully, that is how wise men live.
Through talk many have been overcome,
in silence few have been found dishonourable.
There is no better protection from dishonour
than being the master of your tongue.