You recognize that, of course, as the official Boston motto. Charles Swift translates it and provides a complete copy of a poem by Ralph Waldo Emerson for which that is the sub-title:

THE rocky nook with hilltops three
Looked eastward from the farms,
And twice each day the flowing sea,
Took Boston in its arms;
The men of yore were stout and poor,
And sailed for bread to every shore. ...

Hmm, wonder if Charles will next translate "Ense petit placidam sub libertate quietem."