intellection vs soul-searching

intellection

noun
  • The mental activity or process of grasping with the intellect; apprehension by the mind; understanding. 

  • The mental content of an act of grasping by means of the intellect, as a thought, idea, or conception. 

  • A particular act of grasping by means of the intellect. 

soul-searching

noun
  • Probing introspection; a critical consideration of one's conscience; also, an instance of such consideration. 

adj
  • Involving probing introspection, or a critical consideration of one's conscience, especially motives and values. 

How often have the words intellection and soul-searching occurred in a corpus of books? (source: Google Ngram Viewer )