O God, who seest the wise man and the simple, the clever man and the fool: Grant us to believe upon thy Holy Word with the faith of children, yet grant us also the wisdom to discern the folly of false prophets; and save us from false shepherds who would lead thy faithful flock astray. For where faith is weak, doubt creepeth in, and vanity leadeth to destruction; but where faith is strong, the good man possesseth an unassailable trust in the Lord, and succumbeth not to deception. All this we ask in the name of the one True Shepherd, the Messiah, Jesus Christ our Lord. Amen.
This prayer was first used at Evensong for the Sunday after the Ascension, 2011. It is available, along with a Collect for the Rapture, in a PDF file (also linked from the Library page).