Though all are thus satisfied with the dispensations of Nature, how few listen to her voice! how few follow her as a guide!
What a mighty work he has thus brought to a successful end, with what perseverance, what energy, with what fruitfulness of resource!
THE DASH
XL. The chief purpose of the dash is to indicate that something is left unfinished. Accordingly, it marks a sudden, or abrupt, change in the grammatical structure of a sentence.
When I remember how we have worked together, and together borne misfortune; when I remember—but what avails it to remember?
And all this long story was about—what do you think?
"We cannot hope to succeed, unless——" "But we must succeed."
Note that it is the long dash that is used at the end of a sentence.