Pearse uses alliteration several times in the text of "The Mother." The speaker in the poem refers to the "strong sons" who had been "faithful, and they fought." The repetition of "weary, weary" is another instance of alliteration, adding emphasis to the point being made by repeating the exact same word.
She alludes to the Bible and the support that Irish mothers have traditionally received from their faith when she says of her sons, "They shall be spoken of among their people, The generations shall remember them, And call them blessed" - words closely patterned after Isaiah 59:21.
Personification is used when the speaker refers to her "dead hearth." The hearth of a fireplace is always inanimate as well as fireproof, but describing it as being dead reinforces the fact that once it seemed alive with the activities of two little boys close to its warmth; now it is cold and dead, as are the sons.