Some years ago, in conversation with an artist whose works, perhaps, alone, in the present day, unite perfection of drawing with resplendence of color, the writer made some inquiry respecting the general means by which this latter quality was most easily to be attained. The reply was as concise as it was comprehensive--"Know what you have to do, and do it"--comprehensive, not only as regarded the branch of art to which it temporarily applied, but as expressing the great principle of success in every direction of human effort; for I believe that failure is less frequently attributable to either insufficiency of means or impatience of labor, than to a confused understanding of the thing actually to be done; and therefore, while it is properly a subject of ridicule, and sometimes of blame, that men propose to themselves a perfection of any kind, which reason, temperately consulted, might have shown to be impossible with the means at their command, it is a more dangerous error to permit the consideration of means to interfere with our conception, or, as is not impossible, even hinder our acknowledgment of goodness and perfection in themselves. And this is the more cautiously to be remembered; because, while a man's sense and conscience, aided by Revelation, are always enough, if earnestly directed, to enable him to discover what is right, neither his sense, nor conscience, nor feeling, are ever enough, because they are not intended, to determine for him what is possible. He knows neither his own strength nor that of his fellows, neither the exact dependence to be placed on his allies nor resistance to be expected from his opponents. These are questions respecting which passion may warp his conclusions, and ignorance must limit them; but it is his own fault if either interfere with the apprehension of duty, or the acknowledgment of right. And, as far as I have taken cognizance of the causes of the many failures to which the efforts of intelligent men are liable, more especially in matters political, they seem to me more largely to spring from this single error than from all others, that the inquiry into the doubtful, and in some sort inexplicable, relations of capability, chance, resistance, and inconvenience, invariably precedes, even if it do not altogether supersede, the determination of what is absolutely desirable and just. Nor is it any wonder that sometimes the too cold calculation of our powers should reconcile us too easily to our shortcomings, and even lead us into the fatal error of supposing that our conjectural utmost is in itself well, or, in other words, that the necessity of offences renders them inoffensive.