Apart from The Standard Book of Spells, Grade 4, by Miranda Goshawk, he had a handful of new quills, a dozen rolls of parchment, and refills for his potion-making kit — he had been running low on spine of lionfish and essence of belladonna.
There are no more uses of "essence" in the book.
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To make things better, to enjoy each other’s company, and to empathize are essence of humanity.
There was only—spring itself; the throb of it, the light restlessness, the vital essence of it everywhere...