paraphrase needed for dylan thomas's "do not go gentle"

[noodles]

anyone who can paraphrase the following two lines from the last stanza of dylan thomas's "do not go gentle":

And you, my father, there on the sad height,
Curse, bless, me now with your fierce tears, I pray.

i think that the poet is urging his dying father to fight against, rather than accept death passively, and "on the sad height" may suggest that his father is on the deathbead. But i need word-for-word annotaion for the phrase "on sad height", and "curse, bless, me now with your fierce tears". Why does the poet ask his father to curse and bless the poet himself (oxymoron?), and with his father's tears? or my interpretation misses the point. thx.