From a Window by Christian Wiman

Incurable and unbelieving in any truth but the truth of grieving, I saw a tree inside a tree rise kaleidoscopically as if the leaves had livelier ghosts. I pressed my face as close to the pane as I could get to watch that fitful, fluent spirit that seemed a single being undefined or countless beings of one mind haul its strange cohesion beyond the limits of my vision over the house heavenwards. Of course I knew those leaves were birds. Of course that old tree stood exactly as it had and would (but why should it seem fuller now?) and though a man's mind might endow even a tree with some excess of life to which a man seems witness, that life is not the life of men. And that is where the joy came in.