"And what are things eternal?—powers depart,"
The grey-haired Wanderer stedfastly replied,
Answering the question which himself had asked,
"Possessions vanish, and opinions change,
And passions hold a fluctuating seat:
But, by the storms of circumstance unshaken,
And subject neither to eclipse nor[309] wane,
Duty exists;—immutably survive,
For our support, the measures and the forms,
Which an abstract intelligence supplies;