From The Gospel of Mark by Mary Healy, commenting on Mark 1:1-8:
In the original passages [of Isaiah] God was speaking to his people, but Mark has reworked them to portray God speaking to his Son, telling him, Your coming will be prepared by a forerunner, John the Baptist. Thus the Lord whose way is prepared is Jesus! His paths will be made straight—that is, the people’s hearts will be made ready for his coming—by the contrition for sin and the repentance that come about through John’s preaching. Mark is saying, in effect, “Israel, here is your God! God’s promises are being fulfilled, and a new and greater return from exile is about to take place!”
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