Final answer:
The excerpts do not directly state that Death finds its duties painful, but themes of suffering associated with death are present, which could imply the narrator's pain.
Step-by-step explanation:
The question asks for textual evidence showing why Death, the narrator, finds his duties painful. The provided excerpts don't directly address the duties of Death as a character, nor do they specifically speak to Death finding his duties painful. However, the general theme of suffering and sorrow related to death is evident, as in the reference to the 'Noble Truth of Suffering' from the Bhagavad Gita, which states that 'Death is suffering'. This could imply that the narrator, embodying Death, is surrounded by the suffering of others, which could be interpreted as painful. Additionally, the text from LibreTexts alludes to sorrow and pain associated with death, which might also point to the potential pain Death feels in its role. Nevertheless, without direct textual evidence from the specific text in question, it is difficult to confirm this as the answer.