|The Incredulity of St. Thomas, Caravaggio|
Here is a copy of the prayer and a video of the prayer (in Latin) in song. You should also check out Anima Christi: Soul of Christ by Mother Mary Francis. This book meditates on the meaning of each of the lines of the prayer. I promise it will breathe life into the prayer for you. Finally, I would like to add that you can often find a copy of this prayer in the front or back cover of most church misslettes.