reflecting vs soul-searching

reflecting

adj
  • Given to introspection; thoughtful, reflective. 

  • That reflects. 

  • Having a component that reflects light. 

  • That has been reflected (of light, sound etc.); undergoing reflection. 

noun
  • An instance of reflection 

soul-searching

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

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

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