What was the special mission of John the Baptist?

Answer

"There was a man sent from God, whose name was John. The same came for a witness, to bear witness of
the Light, that all men through him might believe." John 1: 6, 7.

Of what is Christian baptism an evidence?
While at the high priest's house, how did Peter deny Him?
With what promise do the Old Testament Scriptures close?
In what other statement is this same truth expressed?
By what are all men proved guilty?
Has the exact time of Christ's coming been revealed?
Why did God give His only begotten Son to the world?

Questions & Answers are from the book Bible Readings for the Home Circle