John the Baptist is in prison where he begins to question his confidence in Jesus. The cities in which Christ ministers do not respond. The doubts of a saint, however, are massively different from the doubts of a skeptic.
Longfellow translated the words of a German poet (Friedrich von Logau) like this:
“Though the mills of God grind slowly, yet they grind exceeding small; Though with patience stands He waiting, with exactness grinds He all.”
The point is that God’s judgment, though it may not come quickly by our standards, is certain and very exact.
Ruth Graham once said, “If God does not one day judge America, he will have to apologize to Sodom and Gomorrah!” Her point was well taken. If God is so righteous that He has to judge sin sooner or later, then why should anyone think they can rebel against God and escape?