I know a certain tune that my life plays;
Over and over I have heard it start
With all the wavering loveliness of viols
And gain in swiftness like a runner's heart.
It climbs and climbs; I watch it sway in climbing
High over time, high even over doubt,
It has all heaven to itself -- it pauses
And faltering blindly down the air, goes out.
-- Sara Teasdale
(from The Collected Poems of Sara Teasdale)