Theme of the story?

"Digging" is told from the perspective of a writer reflecting on the line of farmers from which he came. Though the speaker does not name himself as Heaney, the two clearly have much in common; this speaker seems to act as a projection of Heaney, or a version of himself that he wants to be. The speaker thinks wistfully of working with the earth, as his grandfather used to and his father still does, and he declares that, as a writer, he wants to do the same work that they did; he wants to dig with his pen. The meaning of this declaration is ambiguous—it could mean that the speaker wants to use his writing to become closer to his family, or that he wants to do his work with the same hardworking mindset that they did theirs. Regardless, this poem uses evocative imagery and language to explore the place that digging takes in the speaker's consciousness and hints at the ways this history shapes him.