User blog comment:Kaloneous/Mass Effect 3 Ending DLC Denied and PAX/@comment-1341687-20120329234302/@comment-1221773-20120329235449

The impression I got from that dialogue was that the unknown force was the Catalyst/Reapers, and the repeating patterns were exemplifying Sovereign's line about the mass relay network existing so that organics can evolve along the paths that the Reapers desire.