"Not yet" [boomerang]

Not yet have I begun my song for you
    that's what the poet wrote   & he were wise
    what is it in your eyes I recognize?
all things are transcient as the morning dew
    what seek you out the window?   scrutinize
the barren branch   the winter yard?   who knew
    how swiftly fruitful summer meets demise?
not yet have I begun my song for you