Jesus provided a strategy for mission which may be summarised in one word namely, detachment. The call is to detachment from anything, which will hold a person up or prevent him or her from engaging in mission.
Often, too much of focus on the results of our actions do not allow us to focus on the action itself. Consequently, our action is neither effective nor efficacious. If we continue to keep in mind that the Kingdom is not ours but His and we are only called to do our best in striving to make this kingdom a reality in the lives of others, then our action will be both effective and efficacious.
Detachment even from the results of our action is an indication that we are aware that God is always in control.