The Devil's Advocate
One of the first scenes we see is Kevin looking into the mirror, and the next thing we know he is entering – resembling Auguste Rodin's The Gates of Hell – a giant door of one of the biggest lawfirms in the world, In New York.
It's wildly known that in the film, New York represents the infamous city of Babylon, as they're both depicted as big cities temptations and hell on earth. That's why everyone speaks different languages in the whole movie. Lomax’s mother warns him of this, and we can all agree that it foreshadows the whole plot.> “Fallen, fallen is Babylon the great. It has become a dwelling place of demons.”
the film repeatedly asks Lomax to choose whether to act in self-interest or for nobler ends. It portrays the struggle with symbols of Christianity – a white-black morality religion – in a world of corruption and nuance. A juxtaposition, you may say.> “the money, we just drank it down … we knew they were guilty.”
In the end, Kevin chooses the worst path possible. Thats how he is left, the last scenes, with Mary's blood on his collar. Almost as if he killed her himself.
Metaphors
The movie’s mirror-in-a-mirror metaphor is particularly fitting because Kevin’s biggest sin is vanity. He’s our typical lawyer, in love with himself, kind of arrogant; perfect image. In case of Mary Ann, seeing demons in mirrored surfaces destroys her sanity; she sees the world as it really is through these weird reflections, whereas Kevin sees what he wants to.