I had heard it as "Holy Spirit" too, and I prefer it that way, but it seems the 5:1 majority, from the first couple pages of google results(Link) record it as "peaceful spirit."
I'm willing to go with the minority on this. Must be a translation thing.
67 posted on 09/13/2013 6:42:48 AM PDT by Mrs. Don-o
("Acquire the Holy Spirit, and thousands around you will be saved. " - St. Seraphim of Sarov)