The choice of words "stacks" and "steal" were chosen by the author of the poem as a way to directly characterize the farmer and to also highlight the possible nature of the fieldmouse.
The words enable the audience to see the proclivities of the fieldmouse as well as it's tendencies.
The penultimate and final lines of the poem serves as a warning to the fieldmouse of what could happen if it flaunted the warning which really is the theme of the poem.
Characterization is the method through which a writer displays a character's personality.
Characterization is exhibited through both direct and indirect characterization. Direct Characterization informs the viewer about the character's characteristics.
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