Well, literally it would be "Katastrepste ta palia gia na xtisoume ta kainouria".
However, more "poetically" and to make more powerful sense in modern Greek, I would say "Sti staxti ta palia gia na xtisoume kainouria" or "Sti staxti to parel8on gia xari tou mellontos" or "Kapste to parelthon gia na xtisoume to mellon"
(i.e. burn the past to build the future). I would prefer the last one.
Happy New Year to you "a_boyer"!!!