The question is not yet settled, whether madness is or is not the loftiest intelligence-- whether much that is glorious-- whter all that is profound-- does not spring from disease of thought-- from moods of mind exalted at the expense of general intellect.  They who dream by day are cognizant of many things which escape those who dream only by night.  In their gray visions they obtain visions of eternity, and thrill, in awakening, to find that they have been on the verge of the great secret.  In snatches, they learn something of the wisdom which is of good, and more of the mere knowledge which is of evil.  They penetrate, however, rudderless and compassless into the vast ocean of "light ineffable," and again, like the adventures of the Nubian geographer, "agressi sunt mare tenebrarum, quid in eo esset exploraturi."