Neptune in the 12th House
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  This usually indicates a strong psychic ability, which in some people remains 
  suppressed. Many individuals, however, are forced to respond to the urgings of 
  their inner conscience by dissolving a karmic debt through serving those that 
  suffer. Thus, many doctors and nurses have this planetary placement. Neptune 
  in this house manifests all its most positive and problematic characteristics, and 
  you will be very sensitive to many of the unknown forces that are present in your 
  environment. You probably experience this psychic energy more 
  subconsciously rather than consciously. Without development and training, you 
  could become a victim of your own subconscious,  where you find yourself 
  overwhelmed by feelings and vibrations received from others. Take care not to 
  let these feelings turn into the kind of depression where in extreme cases drugs 
  and alcohol seem to be the only way out. You may experience intense feelings 
  of loneliness, especially if you are somehow being held in bondage to others.  

   
   
  There is a tendency here to perceive that the solutions to problems in life only 
  become apparent once the problem has disappeared. You may need to 
  understand that there is no evil, only an absence of good, and that the contrasts 
  of this dimension provide laughter and sadness and beauty next to ugliness. 
  One particular manifestation of Neptune in this house is that you can become 
  completely absorbed in daydreams and fantasy-withdrawing from reality into 
  your own secluded world. You will probably need periods of solitude and 
  self-reflection to break down the energies that have been built up during your 
  interactions with others. It might be advisable to develop meditation and 
  grounding techniques so that you are better able to handle and differentiate 
  between the different types of energy that surrounds you. At its best, Neptune in 
  the twelfth house, offers almost messianic capabilities. It is up to you to elevate 
  towards the Christ consciousness. It is also worth noting that when the student is 
  ready, the teacher appears!