Dylan Thomas - Poetry

This next poem is from Dylan Thomas and it's titled 'Do Not Go Gentle into that Good Night'.  This poem was written to his father as he was dying.  Sadly, Dylan Thomas didn't live very long.  Died before he was forty.

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.

Good men, the last wave by, crying how bright
Their frail deeds might have danced in a green bay,
Rage, rage against the dying of the light.

Wild men who caught and sang the sun in flight,
And learn, to late, they grieved it on its way,
Do not go gentle into that good night.

Grave men, near death, who see with blinding sight
Blind eyes could blaze like meteors and be gay
Rage, rage against the dying of the light.

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.

In some ways this seems more like a classic poem than a modern one.  There is a rhyme scheme, though a very simple one.  I think that it's the repeated poetic phrases though.  'Do not go gentle into that good night/... Rage, rage against the dying of the light.'  Both phrases are magnificent.  The rest of the poem hardly matters.
I'm also struck by how dated this sentiment seems.  There is a popular thought in our society that when someone feels ready to die, we should cheer them on to the finish line.  Not so, says Thomas.  We should fight on.  We shouldn't meekly submit.  I'm quite curious about how this poem would be received by advocates of euthanasia. 
I quite like it myself.