approbation vs sweetness and light

approbation

noun
  • The act of approving; an assenting to the propriety of a thing with some degree of pleasure or satisfaction; approval, sanction, commendation or official recognition. 

sweetness and light

noun
  • That which is good, pleasant, pure, etc. 

How often have the words approbation and sweetness and light occurred in a corpus of books? (source: Google Ngram Viewer )