It is difficult in the extreme to know exactly what is here meant. No doubt it is needless for a guide to drop a plumb-line down every crevasse that he has to cross. It would be great waste of time to lecture his travellers on the laws that regulate the motion of glaciers or the dip of the mountain strata. But what are the doctrines that stand in this relation, or this no-relation, to the spiritual life? Is it meant that all theology should be swept away like a dusty old cobweb? I would go myself as far as this, that the fewer and simpler the doctrines that a clergyman preaches, the better; that all doctrines should be required to pass the test of reason and conscience, which are also in their degrees Divine revelations, so far, at least, as this, that no doctrine can be admitted which is demonstrably repugnant to either one or the other. And in the third place, the greatest care should be taken to discriminate matters of faith, real axioms of religion, from pious opinions or venerable practices which have no vital connection with the Christian faith; which, to use Burke's phrase, all understandings do not ratify, and all hearts do not approve. A grave responsibility rests upon those who neglect this discrimination. It is also a point of the highest importance that when most doctrinal a clergyman should be least dogmatic; that he should remember that all doctrine, by the necessity of the case, is cast into an antithetical, more or less paradoxical shape; that he should never lose sight of the harmony and balance between intersecting truths, or of that unfortunate tendency of the human mind to seize upon and appropriate points of difference in their crudest and most antagonistic form, to the exclusion of points of agreement; that he should always do his best to show the reasonableness of the Christian teaching, its analogy and harmony with all the works of God; that where his knowledge fails, he should frankly confess that it does fail, and not try to eke it out by guesses, or to disguise its insufficiency by rhetoric.