Plants and animals don't fight the winter; they don't pretend it's not happening and attempt to carry on living the same lives that they lived in the summer. They prepare. They adapt. They perform extraordinary acts of metamorphosis to get them through. Winter is a time of withdrawing from the world, maximising scant resources, carrying out acts of brutal efficiency and vanishing from sight; but that's where the transformation occurs. Winter is not the death of the life cycle, but its crucible.
Angels show their love for God through their service of other creatures, just as we are enjoined to show our love for God by serving one another. Angels make God's goodness concrete, both in this life and in the life to come.