The term mixed motives suggests that fallen motives energize everything I do. In this model, if motives are pictured as the three main liquid-fuel rocket engines on the NASA space shuttle, then one engine is an ulterior motive and the other two are pure motives, and they always fire together. Hence, I never preach from a pure heart. As I consider my experience, though, that model rarely holds true. The better picture is an automobile engine with eight cylinders,