Automatic Ethics

15"Watch out for false prophets. They come to you in sheep's clothing, but inwardly they are ferocious wolves. 16By their fruit you will recognize them. Do people pick grapes from thornbushes, or figs from thistles? 17Likewise every good tree bears good fruit, but a bad tree bears bad fruit. 18A good tree cannot bear bad fruit, and a bad tree cannot bear good fruit. 19Every tree that does not bear good fruit is cut down and thrown into the fire. 20Thus, by their fruit you will recognize them.
21"Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven. 22Many will say to me on that day, 'Lord, Lord, did we not prophesy in your name, and in your name drive out demons and perform many miracles?' 23Then I will tell them plainly, 'I never knew you. Away from me, you evildoers!'
Matthew 7

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Its not about what we do, its about who we are!  But who we are will naturally and automatically be reflected in what we do.  We do not say, "do this," or, "don't do that," but rather we say "put on Christ."  We do not say, "this is God's will," or, "that is not God's will," but rather we say, "be transformed and then you will know God's will."  The Christian admonition is to embrace the work of the Spirit, Christian ethical decisions are a response to that embrace.  In this way Christian 'ethics' are automatic.