The spoken word is audibly fleeting but morally eternal.
Our hearts will one day give an account for words that overflowed from its contents.

Nobody can tame the tongue. It is a restless evil, full of deadly poison. With it we bless our God and Father, and with it we curse men who are made in the image of God. Out of the same mouth comes blessing and cursing. My brothers, these things ought not to be so.
James 3:8-10, WEB