Do not go gentle into that good night.
Old age should burn and rave at close of day;
Rage, rage against the dying of the light.
Though wise men at their end know dark is right,
Because their words had forked no lightning they
Do not go gentle into that good night.
Note that these ‘good men’ wish they had done more in life — “their frail deeds might have danced” … so are said by the poet to ‘rage’.  This implies anger. The normal expectation is for the ‘good men’ to accept death peacefully, but not for the poet.  This is echoed by the “grave men” in stanza five. Again, the metaphor for death (“the dying of the light”) is written at the end of the line. 

Do Not Go Gentle Into That Good Night