Hope springs eternal in the human breast;
Man never Is, but always To be blessed:
The soul, uneasy and confined from home,
Rests and expatiates in a life to come.
An Essay on Man, Epistle I, 1733
For the pedantic:
intr.v. ex·pa·ti·at·ed, ex·pa·ti·at·ing, ex·pa·ti·ates
1. To speak or write at length: expatiated on the subject until everyone was bored.
2. To wander freely.