The speaker describes his father as sitting “there on the sad height.” This choice of imagery alludes to his father standing on the edge of the mortal world, looking out into the valley of death, deciding whether or not to let the light die. The speaker prays for his father to “curse, bless” him with his “fierce tears,” the passionate cries are both heartbreaking and heroic. The speaker does not want the inevitable death of his father to happen, but if he fought as the other men described in the poem did, then he is seen as gallant. The end of the villanelle is both of the refrains, a final plea to the father before he lets the light die.
Throughout the villanelle, the speaker describes the various men of his father’s generation and how the men lived their lives; wise, good, wild, and eventually grave men who look down from their “sad heights,” these men eventually evolve into the subject of the poem, the father. Dylan Thomas’s poem “Do Not Go Gentle into That Good Night” provides an image of evolution of life slowly moving into death through villanelle structure. Without the poems prosody, the desperate plea of fighting for life even when death is near would not be an ever present