Blessed is anyone who does not stumble on account of me

Matthew 11:1-10
Jesus replied, “Go back and report to John what you hear and see:  The blind receive sight, the lame walk, those who have leprosy are cleansed, the deaf hear, the dead are raised, and the good news is proclaimed to the poor.  
Blessed is anyone who does not stumble on account of me.
I will send my messenger ahead of you, who will prepare your way before you.  
Mal. 3:1 -- I will send my messenger, who will prepare the way before me. Then suddenly the Lord you are seeking will come to his temple; the messenger of the covenant, whom you desire, will come,” says the Lord Almighty.
Why?
John  held prisoner by Antipas, he expected the Messiah to come in judgment. Jesus' reply reminds John of the other aspect of Messiah's work, which he is fulfilling.
Jesus thinks no less of John for his doubts. He is the greast of prophets, the latter-day Ellijah predicted by Malachi(4:5).
Jesus is the Foundation of faith and he is the way to the Lord. He is the first stone of the truth.
When people lost free or under prisoner, he may frustrated in everything, even to the Jesus Christ. Jesus is fulfilling in Messiah's work.
How?
Do not lost the faith, for Jesus is my savior, my hope, and my God.