In a similar vein I think these lines from T.S.Eliot's poem "The Hollow Men" beautifully expresses one's struggles with the self:

  Between the idea
  And the reality 
  Between the motion 
  And the act
  Falls the shadow

  Between the conception 
  And the creation 
  Between the emotion 
  And the response 
  Falls the shadow

  Between the desire
  And the spasm 
  Between the potency
  And the existence
  Between the essence
  And the descent
  Falls the Shadow