Dizeres de Samurai ( VII )

"To talk about other people's affairs is a great mistake. To praise them, too, is unfitting. In any event, it is best to know your own ability well, to put forth effort in your endeavors, and to be discreet in speech."

( pág. 82 do "Hagakure - the Book of the Samurai" de Yamamoto Tsunetomo, 1658- 1719 )