Continuing with Mark Chapter 1
1:2, 3
There had been no God-sent prophets for 400 years, since the days of Malachi (who wrote the last book of the Old Testament).
Isaiah was on e of the greatest prophets of the Old Testament. The second half of the book of Isaiah is devoted to the promise of salvation - that was fulfilled by Jesus Christ.
Not only did Isaiah wrote about the Messiah, Jesus Christ, he also wrote about the man who would announce his coming... John the Baptist. John's call to "make his path straight" meant that people should give up their selfish way of living, renounce their sins, seek God's forgiveness, and establish a relationship with the almighty god by believing and obeying his words as written in the Bible.
Had the prophet Isaiah predicted that John the Baptist and Jesus Christ would come? How did he know? God promised him that a Deliverer would come to Israel, and that a voice crying in the wilderness would prepare the way for him. Isaiah's words comforted many people at that time... and now, we too can be comforted by knowing that God keeps his promises.
As we study the book of Mark, keep in mind that it is more than jsut a story, it is part of God's Word. In it God is revealing to us his plans for human history.