Re: Thor 2 Dark World news, speculation and pictures possible Spoilers - - -
I don't think it is ever outright said. But considering who was hiding it and all the imagery, what I got from the situation that they were an ancient order who worshiped Odin. Perhaps because he proved his "Godliness" and/or saved them at some point. Then at some point he entrusted them with the Cube for whatever reason. Remember, it is "the power of the Gods".
"The Force is strong in my family. My father has it. I have it. My sister has it. You have that power too."