The use of the dark of night motif in this except on Romeo and Juliet is to create a sense of urgency.
The excerpt described events that took place at night which was a time when movement wasn't exactly encouraged.
Friar Laurence is a religious man who offers advice to Romeo and Juliet when he can so that they would experience less familial conflict.
The use of the dark of night motif was therefore to show that there was a sense of urgency because if there wasn't, Friar Laurence would have given his advice in the daytime.
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