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Wiktionary
of the essence

a. important, indispensable, crucial.

WordNet
of the essence

adj. of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence" [syn: all-important(a), all important(p), crucial, essential, of the essence(p)]

Usage examples of "of the essence".

He was silent for a moment, and when he spoke again, his lean seamed face and care-worn eyes were quietly eloquent with the integrity of devotion and loyalty that was of the essence of his life.