The lines make use of metaphor comparing death to the darkness of nightfall and life to a bright sunny day.
The poem could be better understood by appreciating the symbols used by the poet.
Dylan Thomas (1914-1953) was born in Swansea, Wales.
There, he attended a school where his father taught English.
Unfortunately, he indulged in it recklessly, drinking heavily, and died a year after the poem was published, in 1952.
“Do Not Go Gentle Into That Good Night” is a villanelle, a form of poetry popularized mainly in France in the sixteenth century.Copyright 1938, 1939, 1943, 1946, 1971 New Directions Publishing Corp.The poem ‘Do Not Go Gentle Into That Good Night’ is in the form of a Villanelle, six stanzas with a simple rhyme scheme along with a complex message of the poem.However, when Jean Passerat (1534-1602) wrote a villanelle whose format caught the fancy of critics, that format became the standard for all future villanelles.The format is as follows:: two lines, the first and third of the first stanza, must be repeated in the other stanzas.: Good men has the force of wise men in the previous stanza.The message expressed in both stanzas is similar: Men facing death realize they could have done more and thus fight against the dying of the light.Here is the pattern: Line 1 of the first stanza is repeated as line 3 of the second stanza, as line 3 of the fourth stanza, and as line 3 of the sixth stanza.Line 3 of the first stanza is repeated as line 3 of the third stanza, line 3 of the fifth stanza, and line 4 of the sixth stanza.Except for the second one of Stanza 5, each line in the poem has ten syllables (five feet).The first syllable in a line is unstressed, the second is stressed, the third is unstressed, the fourth is stressed, and so on. (If you need a detailed explanation of iambic pentameter and other metric formats, click here.)The following example demonstrates the metric scheme of the first two lines.