around him were making shipwreck--that it was his unselfish devotion to truth, his humility, and the practice of self-control, which enabled him to rebuke the suggestions of vanity and self-interest, and, with the sternness of an impartial judge, to condemn to silence and oblivion even the offspring of his own mind, for which he doubtless felt a parent's fondness, when it fell short of that standard of perfection which he had reared? From this incident in the life of that great man, we may draw, I think, a most useful lesson, which we may apply with good effect to fields of inquiry far transcending those to which the anecdote has immediate reference. Take, for instance, the wide region occupied with moral and political, or, as they are styled, social questions: observe the wretched half- truths, the perilous fallacies, which quacks, greedy of applause or gain, and speculating on the credulity of mankind, more especially in times of perturbation or distress, have the audacity to palm upon the world as sublime discoveries calculated to increase, in some vast and untold amount, the sum of human happiness; and mark the misery and desolation which follow, when the hopes excited by these pretenders are dispelled. It is often said in apology for such persons, that they are, after all, sincere; that they are deceived rather than deceivers; that they do not ask others to adopt opinions which they have not heartily accepted themselves; but apply to this reasoning the principle that I have been endeavouring to illustrate from the life of Watt, and we shall find, I think, that the excuse is, in most cases, but a sorry one, if, indeed, it be any excuse at all. God has planted within the mind of man the lights of reason and of conscience, and without it, He has placed those of revelation and experience; and if man wilfully extinguishes those lights, in order that, under cover of the darkness which he has himself made, he may install in the sanctuary of his understanding and heart, where the image of truth alone should dwell, a vain idol, a creature of his own fond imaginings, it will, I fear, but little avail him, more especially in that day when the secrets of all hearts shall be revealed, if he shall plead in extenuation of his guilt that he did not invite others to worship the idol until he had fallen prostrate himself before it.