a seed pushing itself beyond itself

Many arrivals make us live: the tree becoming
Green, a bird tipping the topmost bough,
A seed pushing itself beyond itself,
The mole making its way through darkest ground,
The worm, intrepid scholar of the soil—
Do these analogies perplex? A sky with clouds,
The motion of the moon, and waves at play,
A sea-wind pausing in a summer tree.

What does what it should do needs nothing more.
The body moves, though slowly, toward desire.
We come to something without knowing why.

[Theodore Roethke {1908-1963} 'The Manifestation' from The Collected Poems]