Weyoun: The Vorta used to be quite different from what we are today. We were forest dwellers. Small, timid ape-like creatures living in hollowed out trees, eating nuts and berries, and also lived in fear of many predators that would hunt us for food. One day, a wounded Changeling came stumbling through the forest fleeing from a mob of angry solids.
Odo: Why were the solids chasing the shapeshifter?
Weyoun: What does it matter? The solids have also feared and mistrusted shapeshifters. You know that. Well, a family of Vorta hid the Changeling from his pursuers, and in exchange for saving his life, the Changeling promised the Vorta that one day, we would be transformed into powerful beings - that we would become an important part of a great new empire that would stretch across the galaxy.
Odo: And the Changeling kept his word.
Weyoun: Imagine, Odo, my people were once little more than apes, and look at us now. Look what you've done for us.