Full Idea
Only a man of very great natural gifts will be able to understand that everything has a class and absolute essence, and an even more wonderful man can teach this.
Gist of Idea
Only a great person can understand the essence of things, and an even greater person can teach it
Source
Plato (Parmenides [c.366 BCE], 135a)
Book Reference
Plato: 'Plato IV (Cratylus,Parmenides,Hippias Maj, Min)', ed/tr. Fowler,H.N. [Harvard Loeb 1926], p.227