"The mind turned inwards is the Self (Christ); turned outwards, it becomes the ego (Devil) and all the world" - Sri Ramana Maharshi.
When Maharshi says 'turned inwards' he means a still meditative mind deeply present in and of the moment. A still mind receives the gifts of Spirit. An active mind in thinking receives nothing from Spirit.
The Christ Mind serves the true Self as Spirit. The Devilish Mind serves only itself for it is unconscious of itself Spiritually.