The mouth is living unto God is just about as important as it is the BREATHING.
No idiot can claim that he breathed ONCE and therefore doesn't have to breath anymore. Breathing is something you must do throughout your entire life.
If you are not vocally impaired you should thank God. And you should use your mouth to exercise your spiritual being to contact, touch, commune with God. And such communion is good if it becomes almost like breathing.
In early human history people began to drift away further and further from God. Some less than stupid ones realized that they were mortal, weak, and frail without the Almighty. And they in the fourth
generation of mankind began to use their mouths to CALL UPON THE NAME OF GOD.
" And to Seth also a son was born, and he called his name Enosh. At that time men began to call upon the name of Jehovah." (Gen 4:26)
means - frail and mortal.
The hint is that people began to realize that they were not that strong in themselves living apart from their Creator God.
Men and woman began to CALL on the name of God to have a relationship with the God whom they were drifting apart from.
Maybe some ancient Rajk999 was there too, complaining about "mouth worship," holding people BACK from experiencing God.