salt of the earth vs valuable

salt of the earth

noun
  • A decent, dependable, unpretentious person. 

valuable

adj
  • Having a great value. 

  • Estimable; deserving esteem. 

noun
  • A personal possession such as jewellery, of relatively great monetary value. 

How often have the words salt of the earth and valuable occurred in a corpus of books? (source: Google Ngram Viewer )