Question

Into the dreary desert sand of dead habit.
(Name and explain the figure of speech in the above line.)​

Answer 1

Habits don't literally die, especially not while we are still using them, so "dead" here stands as a metaphor for things we do repeatedly and unthinkingly. Habits are also not a desert, but a dreary desert of endless sands is an image of monotony and barrenness that suggests that unthinking habits get us nowhere and yield no harvest.