It was discovered after a while, however, that Aunt Penniman was but an accident in Catherine’s existence, and not a part of its essence, and that when the girl came to spend a Saturday with her cousins, she was available for "follow-my-master," and even for leapfrog.
There are no more uses of "essence" in the book.
Show samples from other sources
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...