Quaff the muddy and turbulent streams of earth?

(Jared Waterbury, 'Who are the Happy?')

True piety makes the heart sick of all inferior
pleasures. It has henceforth lost, in a great
measure, its relish for the low and transient
delights of the sensual and frivolous.

After having tasted of so pure a fountain, why,
indeed, should it turn back to quaff the muddy
and turbulent streams of earth?

Why, after a glimpse of celestial glories, should
it be intoxicated by the artificial and unsatisfying
round of this world's vain amusements?