Your Mind is the Scene of the...

 Another key element in the building climax of the movie is the fact that the mark's subconscious has been trained, and therefore militarized. Instead of dealing with peaceable projections they are forced to deal with gunfire, a train running through downtown streets and increasing levels of security the deeper into his mind they go.  In the movie projections are a part of one's subconscious, and therefore something that one cannot control; however, the message is clear that it can be trained and in turn become a source of power and strength rather than a liability.

I believe whole-heartedly in the power of the mind, and in this concept that we can train our thoughts and wield them to shape our destiny. Something as simple as the placebo effect illustrates the power of one's mind to overcome and alter outward circumstances, but James Allen describes it best.  His short treatise, As a Man Thinketh, is pure brilliance, and I encourage any who have not read it to take the time to do so.  On the power of our thoughts (and therefore our minds) he states:

Thought and character are one…the outer conditions of a person’s life will always be found to be harmoniously related to his inner state. The outer world of circumstance shapes itself to the inner world of thought…Circumstance does not make the man; it reveals him to himself…Man, therefore, as the lord and master of thought, is the maker of himself, the shaper and author of environment.

In Inception, a trained (or in other words, focused) mind is a source of security and protection. What could you use a trained mind to accomplish?

Calling all Lions!!