The use of repetition and parallelism has a profound impact on the mood of the poem. To illustrate this, the lines “rage, rage against the dying of the light” and “Do not go gently into that good night” are repeated throughout the poem, clearly demonstrating the stress and urgency of the poet's tone. It is used to further emphasize Thomas' emotional and moving appeal to his father to embrace life until the very end. Additionally, repeating “rage” also increases the intensity of the reprimands. Second, Dylan describes four kinds of men to his father through parallelism. The use of “wise men” is a reproach to his father’s desire to accept death as a finality. Although the “wise men” see death as salvation, as “darkness is right” implies, they would not succumb to death because they had “forked no lightning”. This indicates that one should not simply die without leaving a "hole in the universe". The “good men”, until their last breath, mourn the loss of their “fragile acts”, in which the act evokes both the physical body and benevolence. The “wild men,” full of life and song, try to catch the sun as if life were one long day, from dawn to dusk, but realize too late their prodigal nature. They too mourn their actions and fight against death. Thomas concludes his repetitive display of ideals with "grave men", who according to Thomas, even in their final moments, can "blaze like meteors and be gay". Thomas gives this final simile to represent the satisfaction one feels when looking back on one's life, preventing them from feeling the despair and worthlessness that Thomas wants his father to move away from. Thomas's use of diction also plays a decisive role in the poem. Firstly, the predominant medium of the paper......further emphasizes the desire to live. Finally, “there on the sad height” used in the last stanza uses a biblical reference. This sad height could very likely represent the valley of despair that separates the human world from the metaphysical world. Dylan describes his father as being on the edge of the human world to make the mood more solemn and somber as well as to emphasize the daunting prospect of his father's recovery. Do Not Go Gentle Into That Good Night is a very subtle and complex poem that focuses on glorious death while avoiding death. Throughout the poem, Dylan Thomas uses powerful means to create a melancholic yet urgent tone as we witness the passing of his father. To quote Mary Alice Young: “Death is but a promise made to each of us at birth, but before the promise is kept,” we should each of us live life to the fullest..