The Optative in the New Testament

There are only 70 optatives in the entire New Testament that's Dan Wallace's count. In general the optative conveys this idea it's the mood that a Greek writer would use when he wished to portray an action as not only potential but also possible. By using an optative Luke is telegraphing here that look you know what what God did this with disinheriting the nations and now handing them over to the other gods.