Leisure or Pleasure?

I was wandering alone in the park
just before it was getting dark,
when a passing thought came to me
how lucky birds were to be free.
I wanted then to stop and stare
at a pony, and a grey mare,
and I quote a very famous ode
which came into mind as I strode.
I asked aloud, with no-one there,
‘What is this life if full of care?’