central vs of the essence

central

adj

  • Being very important, or key to something. 

  • Having or containing the centre of something. 

  • Being in the centre. 

  • Exerting its action towards the peripheral organs. 

noun

  • centre 

of the essence

adj

  • Important, indispensable, crucial. 

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