Perfect: the essence of something in its purest form: the most typical example or representative of.
1) The Patheon in Greece was comsidered the quistessence of well-proportioned buildings.
2) A selfless desire to help others is the quistessence of the virtue of charity.
Middle English, from Middle French quinte essence, from Medieval Latin quinta essentia which literally means 'fifth element'.
acme, beau, ideal, classic, epitome, exemplar