It's said in what is basically a religious context. It's probably equivalent to "Amen" in Judeao-Christian prayer.

When, at the end of the mini, Adama says it at the beginning of his little speech, and again at the end of it, he's basically drumming up some ferver (interest, excitement, focused attention) on what the priestess said before him and then on what he has just said.

In fact, the term "Amen" could be loosely translated into this phrase, but it would more accurate to compare it to this phrase than to say that this phrase means "Amen".