"It is said of the angel of Revelation 10, that he 'crieth with a loud voice', and the first and third angels of Revelation 14 deliver their messages with a loud voice. From these expressions has risen a phrase that is very familiar to all Seventh-Day Adventists-The Loud Cry. It has always been used in anticipation of the time when the truth for our times would go forth accompanied by a divine energy."
Special Testimonies E.G.W.
And the third angel followed them, saying with a loud voice, If any man worship
the beast and his image, and receive his mark in his forehead, or in his hand, The same shall drink of the wine of the wrath of God, which is poured out
without mixture into the cup of his indignation;
Revelation 14:9,10