Day of Trouble is one step into the Valley of Vision. This vision the Prophet Isaiah saw concerns Judah. But also brings into the future written in the book. These also relate to Revelation and the time of the end. The prophets vision is so real, he feels the trouble with every bone and muscle in his body. The spoiling of Judah is imminent because they have fallen away. The church in the new covenant is also warned of a time, the judgment will begin at the house of God Peter says.