Paul, Silvanus, and Timothy, to the assembly of the Thessalonians in God the Father and the Lord Jesus Christ: Grace to you and peace from God our Father and the Lord Jesus Christ.
During the period of the Great Tribulation when the sixth seal is opened and these cataclysmic judgments are taking place in the universe, awesome fearful things happening. "And the kings of the earth and the chief captains and all will be hiding, calling unto the rocks and unto the mountains, fall on us and hide us from the face of the Lamb, for the day of His wrath has come and who shall be able to stand?" ( Revelation 6:15-17 )