FLYING

 MASTERY OF SKY

High there, how he rung upon the rein of a wimpling wing 

In his ecstasy! then off, off forth on swing,

  As a skate's heel sweeps smooth on a bow-bend:

 the hurl and gliding 

  Rebuffed the big wind. My heart in hiding 

Stirred for a bird,—the achieve of; the mastery of the thing! 

Gerard Manley Hopkins

 from 'The Windhover'