The main theme if this poem is motherly love. One proverb in particular that relates to the poem is “Love never gets lost, it's only kept.” This proverb means love is a feeling you can never get rid of. This proverb relates to the poem with the mother's relationship with her child.
The best part of the novel is the one that says- Night found him leg weary with hands and face lashed by the branches. that explains and supports the idea