Question

does the poet compare the similar things in the extract​

Answer 1

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Difficulties, when faced by people, tend to leave them hopeless and shattered. It takes a lot of courage to overcome any problem and to solve it. If we take a clue from the poem and compare difficulties to fog, we find that just like fog, difficulties also come and go.

One need not be hopeless and lose courage when problems come, one should rather think of it as fog, meaning that it has not come to stay but will always leave, like fog.