If we do fall back into sin, the response must be the same - once more, we must stand up, pick up our pallet and walk. It is important to note that those physically healed by Jesus, afterwards began an active life of ministry. More often than not Jesus did not want the newly healed to follow Him as a traveling disciple, but to go home, go back to from where they came, and show others the great things God has done for them. Spreading the word of God, making known the greatness of God, does not always demand that one go off to a foreign mission or battle injustice on the main line, although some souls may indeed be called to this. The results can be astounding, perhaps even frightening.
Sin is the ultimate bondage, worse then any handicap, physical or mental.
I wonder about the famous call narratives of the Bible - Moses, Isaiah, Jeremiah, or even the in the lives of the great saints where their was so much apprehension in beginning a sacred call. You are just frightened. But with Me there is nothing to fear, not the worse pain, not even the jaws of death itself. There is only one thing to fear - the pain of loss that is ultimate separation from God, where sin and the devil have their ultimate triumph of despair. There is one call narrative in Scripture that should be our ultimate example, one that was not round about or minced any words - the Annunciation of Our Blessed Mother.