Do not go gentle into that good night

The message of this poem is to never give up.The mood that it create is sadness in this below because the men had die and the light two.

And you, my father, there on the sad height,
Curse, bless, me now with your fierce tears, I pray.
Do not go gentle into that good night.
Rage, rage against the dying of the light. 

The poet uses repetion to create a mood in the reader. Other poetic device is used 
smile.