True, a specific structure.
Hello. You did not say which poem this question refers to, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
In general, we can say that the first lines of a poem have the effect of determining the tone and the main subject which the poem will develop in the following lines. In this way, the first two lines can fulfill this role, mainly in relation to the tone of the poem.
Answer:
Luke plays the drums in the orchestra if Katya plays the clarinet.
William Cullen Bryant wants to show with this lovely poem ”Thanatopsis “ which means view on the death in Greek, that death is nothing to be feared. It is the natural thing that we all can die today or tomorrow and we could live with the assurance that we will meet the ones who went before us.
The three lines which best indicate this theme are:
<u><em>Thou go not, like the quarry-slave at night,
</em></u>
<u><em>Scourged to his dungeon, but, sustained and soothed
</em></u>
<u><em>By an unfaltering trust, approach thy grave,
</em></u>