I knew that seclusion and solitude were very necessary for my friend in those hours of intense mental concentration during which he weighed every particle of evidence, constructed alternative theories, balanced one against the other, and made up his mind as to which points were essential and which immaterial.
If I had not every confidence in your nerve and courage I would not suggest it, but it is essential that you should do it.
I do not know that anything essential has been left unexplained.
"It was very essential for Stapleton to get some article of Sir Henry’s attire so that, in case he was driven to use the dog, he might always have the means of setting him upon his track.
There are no more uses of "essential" in the book.
Show samples from other sources
The essential feature of the pen is that it writes so consistently.
I carry all the essential tools and materials I need in this toolbox.