Further; I contend that all the analogies from the fundamental laws of the development of man's nature,--from a consideration of the relations in which that nature stands to the external world,--from the absolute dependence of the individual on external culture, and that of the whole species on its historic development,--are all in favor of the notion both of the possibility and utility of an external revelation, and even in favor of that particular form of it which Mr. Newman and you so contemptuously call a "book" revelation. I. I argue from all the analogies of the fundamental laws of the development of the human mind. Nor do I fear to apply the reasoning even to the cases in which it has been so confidently asserted that there can be no revelation, on the fallacious ground that a revelation "of spiritual and moral truth" presupposes in man certain principles to which it appeals. To possess certain faculties for the appreciation of spiritual and moral truth is one thing; to acquire the conscious possession of that truth is another; the former fact would not make an external revelation superfluous, or an empty name. Every thing in the process of the mind's development goes to show, that, whatever its capacities, tendencies, faculties, "potentialities," (call them what you will,) a certain external influence is necessary to awaken its dormant life; to turn a "potentiality" into an "energy "; to transform a dim inkling of a truth into an intelligent, vital, conscious recognition of it. Nor is this law confined to mind alone; all nature attests its presence. All effects are the result of properties or susceptibilities in one thing, solicited by external contact with those of others. The fire no doubt may smoulder in the dull and languid embers; it is when the external breeze sweeps over them, that they begin to sparkle and glow, and vindicate the vital element they contain. The diamond in the mine has the same internal properties in the darkness as in the light; it is not till the sun shines upon it, that it flashes on the eye its splendor. Look at a flower of any particular species; we see that, as it is developed in connection with a variety of external influences,--as it comes successively under the action of the sun, rain, dew, soil,--it expands in a particular manner, and in that only. It exhibits a certain configuration of parts, a certain form of leaf, a certain color, fragrance, and no other. We do not doubt, on the one hand, that without the "skyey influences" these things would never have been; nor, on the other; that the flower assumes this form of development, and this alone, in virtue of its internal structure and organization. But both sets of conditions must conspire in the result.