If you're not familiar with him, he was an English actor who starred in many movies, with his most famous role perhaps being his portrayal of Obi-Wan Kenobi in the original Star Wars trilogy. 

Lifted from his Wikipedia page, check out the footnotes for more details:

While serving in the Royal Navy, Guinness had planned to become an Anglican priest. In 1954, while he was filming Father Brown in Burgundy, Guinness, who was in costume as a Catholic priest, was mistaken for a real priest by a local child. Guinness was far from fluent in French, and the child apparently did not notice that Guinness did not understand him but took his hand and chattered while the two strolled; the child then waved and trotted off.[56] The confidence and affection the clerical attire appeared to inspire in the boy left a deep impression on the actor.[57] When their son was ill with polio at the age of 11, Guinness began visiting a church to pray.[58] A few years later, in 1956, Guinness converted to the Roman Catholic Church. His wife, who was of paternal Sephardi Jєωιѕн descent,[59] followed suit in 1957 while he was in Ceylon filming The Bridge on the River Kwai, and she informed him only after the event.[60] Every morning, Guinness recited a verse from Psalm 143, "Cause me to hear your loving kindness in the morning".[61]