Dallas Willard's Sense of Ministry
I find this comment by Dallas Willard on his homepage of his website very relevant.
My sense of ministry is to judge the lay of the land for your times and shoot where the enemy is. The enemy in our time is not human capacity, or over activism, but the enemy is passivity - the idea that God has done everything and you are essentially left to be a consumer of the grace of God, so the only thing you have to do is find out how to do that and do it regularly. I think this is a terrible mistake and accounts for the withdrawal of active Christians from so many areas of life where they should be present. It also accounts for the lack of spiritual growth, for you can be sure that if you do not act in an advised fashion consistently and resolutely you will not grow spiritually.
There is a great collection of his articles and recordings on Dallas Willard's website