The consequences of ignorance are certain, unless almost a miracle interpose; but unhappily those of knowledge are of diffident and restricted calculation; unless we could make a trifle of the testimony of all ages, and suppress the evidence of present experience, that men may see and approve the better, and yet follow the worse. It is the hapless predicament of our nature, that the noblest of its powers, the understanding, has but most imperfectly and precariously that commanding hold on the others, which is essential to the good order of the soul. Our constitution is like a machine in which there is a constant liability of the secondary wheels to be thrown out of the catch and grapple of the master one. And worse than so, these powers which ought to be subordinate and obedient to the understanding, are not left to stand still when detached from its control. They have a strong activity of their own, from the impulse of other principles: indeed, it is this impulse that _causes_ the detachment. It is frightful to look at the evidence from facts, that these active powers _may_ grow strong in the perversity which will set the judgment at defiance, during the very time that it is successfully training to a competence for dictating to them what is right. The assertions of those who are determined to find the chief or only cause of the wrong direction of the passions and will in misapprehension of the understanding, are a gross assumption, in a question of fact, against an infinite crowd of facts pressing round with their evidence. This evidence is offered by men without number distinctly and deliberately acknowledging their conviction of the evil quality and fatal consequences, of courses which they are soon afterwards seen pursuing, and without the smallest pretence of a change of opinion; by the same men in more advanced stages still owning the same conviction, and sometimes in strong terms of self-reproach, in the checks and pauses of their career; and by men in the near prospect of death and judgment expressing, in bitter regret, the acknowledgment that they had persisted in acting wrong when they knew better. And this assumption, made against such evidence, is to be maintained for no better reason, that appears, than a wilful determination that human nature cannot, must not, shall not, be so absurd and depraved as to be capable of such madness: as if human nature were taking the smallest trouble to put on any disguise before them, to beguile them into a good opinion; as if it could be cajoled by their flattery to assume even a semblance of deserving it; as if it had the complaisance to check one bad propensity, to save them from standing contradicted and exposed to ridicule for speaking of it with indulgence or respect; as if it stayed or cared to thank them for their pains in attempting to make out a plausible extenuation. It has, and keeps, and shows its character, in perfect indifference to the puzzled efforts of its apologists to reduce its moral turpitude to just so much error of the understanding. But, as for understanding--it should be time to look to their own, when they find themselves asserting, in other words, that there is actually as much virtue in the world as there is knowledge of its principles and laws. We should rather have surmised that, deplorably deficient as that knowledge is, the reduction of a fifth or tenth part of it to practice would make a glorious change in England and Europe.