The thing which the words “The twilight is here” suggest is Douglas’s life is approaching an end.
This refers to the implied meaning of a word that shows the alternative meaning that can be gotten from context clues.
Hence, we can see that from the complete text, there is the narration of the life of Douglas as he approaches his death and the connotative meaning of the word "twilight" is used to show this.
Read more about connotative meanings here:
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