Matthew 11:20-24 Suffer Now, Or Forever.
John was faithful in proclaiming a message of repentance, and for this reason woe was coming upon those who rejected that clear message. Mighty works attesting to the canonical truth that was proclaimed had been performed, and continued to be performed, but many chose their own sin over the truth. One of the truths that Jesus taught was that those who received greater revelatory truth would be subject to a stricter judgment for rejecting it. John may have been in prison for proclaiming the truth, but he would be destined for the kingdom of glory, while those who rejected his message would suffer in hell forever.