“it is not only he who speaks contrary to what he knows who lies, but even more he who speaks contrary to what he does not know”
“He who knows does not speak; he who speaks does not know.”
“He who speaks does not know; he who knows does not speak”
“He who knows, does not speak. He who speaks, does not know.”
“He who does not lie does not know what truth is.”
“he who is (ever ready to) speak about it does not know it.”