"…the vitality of what will be…"

“Every year we have been / witness to it: how the / world descends
into a rich mash, in order that / it may resume. / And therefore / who would cry out
to the petals on the ground / to stay, / knowing as we must, / how the vivacity of what was is married
to the vitality of what will be? / I don't say / it's easy, but / what else will do
if the love one claims to have for the world / be true?
So let us go on, cheerfully enough, / this and every crisping day,
though the sun be swinging east, / and the ponds be cold and black, / and the sweets of the year be doomed.” 

— "Lines Written in the Days of Growing Darkness" (2012), by Mary Oliver