Here he says that it is not only illogical, but immoral to “carry our _assent above_ the _evidence_ that a proposition is true,” to have “a surplusage of _assurance beyond_ the degrees of that evidence.” And he excepts from this rule only self-evident propositions. How then is it not inconsistent with right reason, with the love of truth for its own sake, to allow, in his words quoted above, certain strong “probabilities” to “govern our thoughts as absolutely as the most evident demonstration”? how is there no “surplusage of assurance beyond the degrees of evidence” when in the case of those strong probabilities, we permit “our belief, thus grounded, to rise to assurance,” as he pronounces we are rational in doing? Of course he had in view one set of instances, when he implied that demonstration was the condition of absolute assent, and another set when he said that it was no such condition; but he surely cannot be acquitted of slovenly thinking in thus treating a cardinal subject. A philosopher should so anticipate the application, and guard the enunciation of his principles, as to secure them against the risk of their being made to change places with each other, to defend what he is eager to denounce, and to condemn what he finds it necessary to sanction. However, whatever is to be thought of his _à priori_ method and his logical consistency, his _animus_, I fear, must be understood as hostile to the doctrine which I am going to maintain. He takes a view of the human mind, in relation to inference and assent, which to me seems theoretical and unreal. Reasonings and convictions which I deem natural and legitimate, he apparently would call irrational, enthusiastic, perverse, and immoral; and that, as I think, because he consults his own ideal of how the mind ought to act, instead of interrogating human nature, as an existing thing, as it is found in the world. Instead of going by the testimony of psychological facts, and thereby determining our constitutive faculties and our proper condition, and being content with the mind as God has made it, he would form men as he thinks they ought to be formed, into something better and higher, and calls them irrational and immoral, if (so to speak) they take to the water, instead of remaining under the narrow wings of his own arbitrary theory.