Thomas ' powerful message is contained in the form of a villanelle. The villanelle is a highly structured poem which makes use of a great deal of repetition in its standard nineteen lines. The first five stanzas are tercets while the sixth and last stanza is a quatrain. The first and last lines of the opening stanza are repeated throughout the poem. The opening stanza 's first line is also the last line of the second and fourth stanzas while it is the next to last line of the final stanza. The opening stanza 's last line is also the last line of the third, fifth, and sixth stanzas.
A villanelle also uses a standard rhyme scheme. The first and third line of each stanza rhyme, as does the last line of the final stanza, with a keyword (in the case of this poem, the keyword is "night"). The second line of each stanza rhymes with a second keyword (in this case, "day"). Thus, Thomas expertly focuses on the poem 's main theme of life and death (day and night). He uses enjambment where possible to downplay the end rhymes and thus give his poem a more natural, conversational tone.
In the first stanza of the poem, Thomas beseeches his ailing father to fight for life. Night is metaphorical for death. Because of the importance of the message, the poem 's title is repeated in the first line of the poem as Thomas urges his father not to submit meekly ("do not go gentle") to a death which may seem a welcome prospect ("that good night"). Thomas tells his father the elderly