assess vs reflect on

assess

verb
  • To determine, estimate or judge the value of; to evaluate 

  • To impose or charge, especially as punishment for an infraction. 

  • To calculate and demand (the tax money due) from a person or entity. 

reflect on

verb
  • To think carefully about (something), and give it due consideration. 

  • To give an impression of (used with an adverb). 

  • To access details of (a data type, etc.) at run-time using reflection. 

How often have the words assess and reflect on occurred in a corpus of books? (source: Google Ngram Viewer )