It is asked from the Commander of Faithful Ali ibn Abi Talib:
what is the best creation of God? Imam replayed: Word. He is asked again: what
is the worst creation of God? Imam Replayed: word. Then Commander of Faithful said: because it
is by the word that a person can reach the salvation or fall in misery
(Beharol Anvar, Vol.78: p.55).