Considering the title, the intelligent reader may be curious about why the probably subject of the poem shouldn’t go gentle in “that night”. To note is the use of the adjective “that” instead of the article “the”. Even though the subject should know what night the poet is speaking about. It seems to be like someone is praying someone who cares about to don’t go away.

The stressed words are “go gentle” and “good”. The intelligent reader understands the alliteration of the consonance sound “g” helps to stick these words into the reader’s mind.

Considering the layout is easily to see the poem is arranged in 6 stanzas. The first five stanzas are tercets, then the last one is a quatrain. The poem follows the same pattern in the first 5 stanzas and then the poet interrupts it. So the intelligent reader may expect the last stanza to have more important information than the previous one.

The rhyme scheme is ABA in the tercets, and ABAA in the quatrain.

In the first stanza the second line is also the thesis for this poem. Thomas classifies men into four different categories to persuade his father to realize that no matter his life choices, their consequences, or his personality, there is a reason to live. It is possible that Thomas uses these categories to give his father no excuses, regardless of what he did in life.

The first line in the second stanza, “Though wise men at their end know dark is right,” suggests that the wise understand that death is a natural part of life, and they are savvy enough to know they should accept it. The next line, however, reasons that they nevertheless fight against death because they feel they have not gained nearly enough repute or notoriety in life. “Because their words had forked no lighting” is Thomas’ way of saying that they want to hold on to life in order to be able to leave their mark, thereby sustaining their places in history as great scholars or philosophers.

Thomas moves forward and describes the next stanza as good men. Green bay refers to an eternal sea that marks men's places in history. After reflecting on the past, they decide that they want to live if for nothing more than to leave their names written down in history.

In the fourth stanza the poet describes that wild men, however, have learned too late that they are mortal. They spent their lives in action and only realize as time has caught up with them that this is the end. 

Even more so “caught and sang the sun” refers to how these wild men lived. They were daredevils who faced peril with blissful ignorance. They wasted away their lives on adventures and excitements. 

In the fifth stanza the grave men are the last group Thomas describes: “Grave men, near death, who see with blinding sight” (13). In this line, his use of grave men almost has a double meaning, referring both to men who are saddened and those who are physically near death. They feel the strains of a long life, and they know that they are physically decaying. Their eyes are failing along with the rest of their body, but there is still a passion for existence burning within their eyes despite their frail state.

Finally, in the last stanza, the intent is presented. Thomas claims that all men, no matter their experiences or situations, fight for more time. He urges his father to do the same.

Light and dark play an important role in this poem, as symbols of life and death. From the first stanza to the last, this theme is reinforced with a lot of metaphor and particularly constructions. The use of good night, a pun, and close of day, are a euphemism for death. In this poem there are words of one and two syllables and the only one with three being meteors however it is a poem with strong sounds indeed there are a lot of consonant. The poet created contrasts in the choice of words such as: Gentle and good – burn and rave, Frail and danced - rage and Curse and bless - fierce tearsall reflecting opposite forces at work in the poem, reinforced also by the use of the preposition against. It's as if the speaker wants to rebel from the death, like when come the sunset. 

All things consider I believe the poem gradually answers to my question.

In my opinion everyone has to live their life fully and actively because there is not so much time to appreciate it and if you do not do this when you are near the death you regret all you do not do during your life.