There is much talk about "the end times" these days--and for good reason. I believe we are living in them and the return of our Lord Jesus is very near.
Isaiah saw the end, specifically, the Tribulation also called the "time of Jacob's trouble." He gives a terrifying. description of our world under the wrath of God.
Keep in mind, Isaiah did not see the Church Age. Paul and John give us more insight into where the Church will be during the Tribulation. Needless to say, there's no time to waste--today is the day of salvation!