David declares: "Which man desires life... Guard your tongue from evil." Man is superior to all other creatures because of Heavenly soul. G-d has created man with intellect The intellect is expressed through speech. Man's essence is referred to in the Torah as "living being" in Breishis 2:7 Onkelos translates the possuk "speaking spirit". This speech must be constructive, however, or he would be better off mute. If he uses this power wickedly, he is less than all other created beings, because he can also destroy with this power. Mi ha ish chofetz chaim Who is a man? He desires life. take care regarding your speech... this quality makes one deserve being called an man.