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There are many ways people try to measure spirituality. Some count the number of people they convert. Effectiveness at tasks may be related to spirituality, but we all know people who convert many without ever really being transformed into the image of Christ themselves.
Others judge their spirituality by their spiritual disciplines. "If I pray/memorize Scripture/fast more, I'll be more spiritual!" That's putting the cart before the horse, since spiritual disciplines are tool and products of spirituality, not spirituality itself.
I want to suggest that we cannot measure spirituality, but we can "review our course" on our spiritual journey. Reviewing our course would mean identifying challenges in ministry that God's can help us meet. By asking "what don't I do well that I should be doing better" we identify our shortcoming, those areas where God can work in us. Robert Mulholland says: "The process of being conformed to the image of Christ takes place primarily at the points of our unlikeness to Christ's image. . . . God meets us in those places of our lives that are most alienated from God. " Invitation to a Journey: A Road Map for Spiritual Formation, 37.
By asking "what don't I do well that I should be doing better" we identify our shortcoming, those areas where God can work in us. This is not a way for us to beat up on our selves, nor is it an opportunity to improve ourselves. It is understanding reality—I’m not perfect but God is; I want to grow closer to him, and he can bring me to himself.
Increased effectiveness can be a part of this since defining "effectiveness" would itself become part of reviewing the course. We tend to measure effectiveness based on what we do well. (Those gifted at evangelism tend to use conversions as a positive measure. Those gifted and shepherding use leadership as a measure.) By understanding where we are more effective and less effective, we develop a richer definition of what our goals are.
Spiritual disciplines also become a part of reviewing the course. My prayers, Bible reading, etc., are ways to discover where I am most alienated from God. They are also ways God can use to diminish the alienation.
Reviewing our course is not about quantifying anything and more about understanding the reality of who I am as a person and a minister. It also means allowing God to form me in those areas I least want re-formation.