It's really special that your sister and her partner included you in the ceremony in this capacity. I am guessing people do not often think of this sort of thing as being memorable in the eyes of the individual asked to officiate, but I know that often it is. My husband @marcuspulis has had the honor of doing the same for several friends and loved ones... most notably our eldest daughter and her wife. It's nice that you were able to craft something that spoke to the moment in light of their personalities and spiritual path. The Gospel of Thomas is badass! I can certainly relate to being shy of public speaking. It's fun when in spite of that, it all comes together, and you can enjoy the satisfaction of a personal growth challenge accepted and fulfilled in a way that makes you happy. Good times!