He himself was not the light; he came only as a witness to the light.
He may have been a miracle baby but he was a minor player in the drama about to unfold. He didn't even fully understand what his role was. When in prison he sent a message to Jesus asking if he had got it right.
If even John the miracle baby can doubt, how much more so might we. Although we are told that we are in God's plan and we are assured that he has a plan for us, we seldom know what it is. We must continue to keep faithful and trust that 'he knoweth the way that you take'.