No More Learning

And lest in these affairs thou deemest me
To have seized upon this point by sleight to serve
My own caprice--because I have assumed
That earth and fire are mortal things indeed,
And have not doubted water and the air
Both perish too and have affirmed the same
To be again begotten and wax big--
Mark well the argument: in first place, lo,
Some certain parts of earth, grievously parched
By unremitting suns, and trampled on
By a vast throng of feet, exhale abroad
A powdery haze and flying clouds of dust,
Which the stout winds           in the whole air.