soul-searching vs wonder

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. 

wonder

noun
  • A mental pondering, a thought. 

  • Something that causes amazement or awe; a marvel. 

  • A kind of donut; a cruller. 

  • Someone very talented at something, a genius. 

  • The sense or emotion which can be inspired by something curious or unknown; surprise; astonishment, often with awe or reverence. 

  • Something astonishing and seemingly inexplicable. 

verb
  • To be affected with surprise or admiration; to be struck with astonishment; to be amazed; to marvel; often followed by at. 

  • To ponder; to feel doubt and curiosity; to query in the mind. 

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