He who widely, yet ascensively, expatiates in those in-all-ways-sloping
fields of metaphysical investigation which perplex whilst they captivate,
and bewilder whilst they allure, cannot evitate the perception of
perception's fallibility, nor avoid the conclusion (if that can be called
a conclusion to which, it may be said, there are no premises extant) that
the external senses are but deceptive _media_ of interior mental
communication. It behoves the ardent, youthful explorator, therefore, to
----, &c. &c.