African proverbs in movies

[JLE13]

Al Gore has created the documentary, "An Inconvienent Truth," a film about the global climate changes our world will face.

The film ends with two exhortations. One is to visit the film's official website (www.climatecrisis.net). The other is to pray. Quoting an African proverb, it says, "when you pray, move your feet."

[ChaiMe]

I've seen this documentary a couple of times and I like it. I tried to find this proverb using the search feature on the homepage, but I didn't find it. Did anyone else find it? What's the origin of this one?