This is often mirrored in the daily life of a pentecostal person. This helps me even understand the paradox that is Jimmy Swaggart - a sinful man whom God used as an instrument to bring some to salvation. I personally become bitter with such expression of God's grace - I would prefer God not to use such sinful men as Jimmy Swaggart, yet He does. I would prefer Kenneth Haggin's ministry to die a quick and painful death, yet God uses it as a weak vessel through which God saves.
I wonder if another ambiguous expression of God's will is seen in the book of Acts. Paul receives a vision of a man (aner - which is definitely masculine) calling him to Macedonia for help (Acts 16:9), yet when he arrives, Paul evangelizes a crowd of women (Acts 16:13-14). God's plan is accomplished despite the details be slightly off.
Finally, I found it rather odd that Matthew 18:19-20 was first quoted out of context on this thread. When someone added the context, they quoted what followed rather than what preceded. These verses often annoy the begeebees out of me because they are never quoted in reference to church discpline which is their true context. In this passage, Jesus is assuring them that though they may be alienated from fellow believers when they perform church discipline, they can rest assured that God remains with them. God is even alive in the midst of church discipline?!?!?