When, in such cases as this, we discover that singular inconsistency, which is to be found even in the very _excellence_ of every thing that is _human_,--the perspicacity which sees, at an immeasurable distance, in the field of inquiry, what no other eye has seen, and which yet, in the very objects which it has grasped, is unable to distinguish what is visible to common eyes, are we to lament the imperfection of our mental constitution, which leaves us liable to such error? Or, as in other instances, in which, from our incapacity of judging rightly, we are tempted at first to regret the present arrangement of things, are we not rather to rejoice that we are so constituted by nature? if man had not been formed to _err_, in the same manner as he is formed to reason, and to know, that perfect system of faculties, which excluded error, must have rendered his discernment too quick, not to seize instantly innumerable truths, the gradual discovery of which, by the exercise of his present more limited faculties, has been sufficient to give glory and happiness to whole ages of philosophical inquiry. If, indeed, the field had been absolutely boundless, he might still have continued to advance, as at present, though with more gigantic step, and more searching vision, and found no termination to his unlimited career. But the truths which relate to us physically, on this bounded scene of things in which we are placed, numerous as they are, are still in some measure finite, like that scene itself; and the too rapid discoveries, therefore, of a few generations, as to the most important properties of things, would have left little more for the generations which were to follow, than the dull and spiritless task of learning what others had previously learned, or of teaching what themselves had been taught. Philosophy is not the mere _passive possession_ of knowledge; it is, in a much more important respect, the active exercise of acquiring it. We may truly apply to it what Pascal says of the conduct of life in general. “We think,” says he, “that we are seeking _repose_, and all which we are seeking is _agitation_.” In like manner, we think that it is _truth_ itself which we seek, when the happiness which we are to feel most strongly, is in the mere search; and all that would be necessary, in many cases, to make the object of it appear indifferent, would be to put it fairly within our grasp. “Our hopes, like towering falcons, aim At objects in an airy height; But all the pleasure of the game, Is afar off to view the flight.”