"
the blizzard
Today we will sell our uniform
Live together
Writer says that since they [humanity] have learned so much from their past and now they are capable of foreseeing such events that troubled them, now they can finally sell their ego, pride, self respect and dignities [clothes]. Because when everybody's the same they understand each other better and live united [referred as "live together" and ultimately "sunshine"]. When the differences are put apart they will no longer need the things [like their prides, ego's, dignities, etc.] that lead them to all those troubles [blizzard's]. The writer wants sunshine I. E. Sunshine for everyone. Note: sunshine also refers to hope.