May today there be peace within. May you trust God that you are exactly where you are meant to be. May you not forget the infinite possibilities that are born of faith. May you use those gifts that you have received, and pass on the love that has been given to you. May you be content knowing you are a child of God. Let this presence settle into your bones, and allow your soul the freedom to sing, dance, praise and love. It is there for each and every one of us.
The problem is that the email went on to say that the prayer was written by Mother Teresa, who is not, in fact, a saint. I suspected mis-attribution, so I went to Google and found various copies of the prayer, with or without the rest of the email, attributing it to St. Teresa of Avila, St. Therese de Lisieux, or Mother Teresa, all in about equal doses. None of them seemed to be a website of authority, and I'm beginning to suspect none of the three wrote it at this point.
The character who's going to recite the prayer is a nun and lifelong Catholic, so she's unlikely to be as confused over the matter as I am. Can anyone say with certainty which (if any!) Saint Teresa wrote that prayer?
Google attempts included "St. Teresa's Prayer" and "Saint Theresa's Prayer", and "May today there be peace within".