The theme of the poem is conveyed through lines that refer to the passage of time and the hope and strength of future generations.
The theme of the poem is reflected in several lines. In the last two stanzas, the poet consoles Charles' parents by reassuring them that the world is old and generations pass. The theme of the poem is also conveyed in line 7, where the poet refers to the children's lives as a volume with only the first chapters read, representing the unknown future. Additionally, in line 14, the poet describes the world as belonging to those who come last, indicating hope and strength for future generations.