The original and predominant errour of his commentary, is acquiescence in his first thoughts; that precipitation which is produced by consciousness of quick discernment; and that confidence which presumes to do, by surveying the surface, what labour only can perform, by penetrating the bottom. His notes exhibit sometimes perverse interpretations, and sometimes improbable conjectures; he at one time gives the authour more profundity of meaning than the sentence admits, and at another discovers absurdities, where the sense is plain to every other reader. But his emendations are likewise often happy and just; and his interpretation of obscure passages learned and sagacious. Of his notes, I have commonly rejected those, against which the general voice of the publick has exclaimed, or which their own incongruity immediately condemns, and which, I suppose, the authour himself would desire to be forgotten. Of the rest, to part I have given the highest approbation, by inserting the offered reading in the text; part I have left to the judgment of the reader, as doubtful, though specious; and part I have censured without reserve, but I am sure without bitterness of malice, and, I hope, without wantonness of insult. It is no pleasure to me, in revising my volumes, to observe how much paper is wasted in confutation. Whoever considers the revolutions of learning, and the various questions of greater or less importance, upon which wit and reason have exercised their powers, must lament the unsuccessfulness of enquiry, and the slow advances of truth, when he reflects, that great part of the labour of every writer is only the destruction of those that went before him. The first care of the builder of a new system, is to demolish the fabricks which are standing. The chief desire of him that comments an authour, is to shew how much other commentators have corrupted and obscured him. The opinions prevalent in one age, as truths above the reach of controversy, are confuted and rejected in another, and rise again to reception in remoter times. Thus the human mind is kept in motion without progress. Thus sometimes truth and errour, and sometimes contrarieties of errour, take each other's place by reciprocal invasion. The tide of seeming knowledge which is poured over one generation, retires and leaves another naked and barren; the sudden meteors of intelligence which for a while appear to shoot their beams into the regions of obscurity, on a sudden withdraw their lustre, and leave mortals again to grope their way.