My Muses do not care a pinch of rosin

About what's called success, or not succeeding:

Such thoughts are quite below the strain they have chosen;

'T is a "great moral lesson"[634] they are reading.

I thought, at setting off, about two dozen

Cantos would do; but at Apollo's pleading,

If that my Pegasus should not be foundered,

I think to canter gently through a hundred.