The Catholic doctrine takes as its point of departure the postulate, that rational nature of itself is incapable of attaining or even initiating a movement towards that final end, which has been actually prefixed to it as its terminus. It needs, therefore, from the beginning, a superadded gift or grace, to place it in the plane of its destiny, which is supernatural, or above all that is possible to mere nature, explicated to any conceivable limit. At this point, however, two great schools of theology diverge from each other, each one of which is further subdivided as they proceed. The radical conception of one school is, that nature is in itself an incomplete thing, constituted in the order of its genesis in a merely inchoate capacity for receiving regeneration in the supernatural order. Remaining in the order of genesis, it is in a state of merely inchoate, undeveloped, inexplicable existence, and therefore incapable of attaining its destination. There is, therefore, no end for which God could create rational existence, except a supernatural end. The natural demands the supernatural, the order of genesis demands the order of regeneration, and the wisdom and goodness of God require him to bestow on all rational creatures the grace cognate to the beatific vision and enabling them to attain it. The radical conception of the other school is, that rational nature, _per se_ requires only the explication and perfection of its own constituent principles, and may be left to attain its finality in the purely natural order. The elevation of angels and men to the plane of a supernatural destiny was, therefore, a purely gratuitous concession of the supreme goodness of God, in view, as some would add, of the merit of the incarnate Word. These different theories are entangled and interlaced with each other, and with many different and intricate questions related to them, in such a way as to make a thicket through which it is not easy to find a sure path. It is necessary, however, to try, or else to avoid the subject altogether. The obscurity of the whole question is situated in the relation of created intelligence to its object which constitutes it in the intelligent or rational order. It is evident that a created substance is constituted an intelligent principle by receiving potentiality to the act connoted by this relation of the subject to its object, and is explicated by the reduction of this potentiality into act. The end of intelligent spirit is to attain to its intelligent object, by the act of intelligence. In the foresight of this, the exposition of the relation between intelligence and the intelligible has been placed first in this discussion.