The reader, who passes from the first book of the Treatise, on "the Understanding," to the second, on "the Passions," will, in many instances, feel like one who is awakened from a dream, or as if, after penetrating in solitude and darkness into the unseen world of thought, he had come forth to the cheerful company of mankind, and were holding converse with a shrewd and penetrating observer of the passing world. As Hume was never totally insensible to the elements of social enjoyment, but had indeed an ample sympathy with the joys and sorrows of his fellow men, he appears occasionally, in the midst of his most subtle speculations, to experience a desire to burst from the dark prison of solitude, into which he had voluntarily immured himself, and bask in the sunshine of the world. "Man," he says, in his Treatise, "is the creature of the universe who has the most ardent desire of society, and is fitted for it by the most advantages. We can form no wish which has not a reference to society. A perfect solitude is, perhaps, the greatest punishment we can suffer. Every pleasure languishes when enjoyed apart from company, and every pain becomes more cruel and intolerable." In a remarkable passage, in which, after having long proceeded in enthusiasm with his solitary labours, he seems to have stopped for a moment, and recalling within himself the feelings and sympathies of an ordinary man, to have reflected on the scope and tendency of the system in which he was involving himself, he thus expresses himself, regarding its gloomy tendency, and the effect it has in destroying, in the mind of its fabricator, those stays of satisfactory belief in which it is so comfortable for the wearied intellect to find a resting-place:--