I think the answer is
to encourage people to eat healthy meals
Nathan filled the knothole in the tree to prevent Boo from giving the children gifts. To trick the children, he told them the tree was sick and the knothole needed to be filled.
Considering the first line of the poem <em>"I Hear America Singing"</em>: I hear America singing, the varied carols I hear, and also taking in consideration the <em>entire poem's context</em>, it can be understood that the <em>speaker's view of the American identity is one of an identity composed by many voices singing many different songs</em>. That, of course, as a <em>metaphor</em> for <em>different people living different realities that contribute to forming a nation's identity</em>. The speaker <em>lists</em>, in the poem, various professions and activities being held by these people:
<em>"The carpenter singing his as he measures his plank or beam, </em>
<em>The mason singing his as he makes ready for work (...)</em>
<em>The boatman singing what belongs to him in his boat (...)"</em>
And so he continues. <em>"Each singing what belongs to him or her and to none else"</em>, he says, conveying that this<em> identity would be composed by many different realities, points of view, and stories</em>, because every single one of these people <em>can only "sing" or express from their points of view</em>. Thus, the <em>American nation's identity is a mixture of various realities</em>, being each one of them important to be heard. Together, they create a whole based on variety.
