determinability

One of the wisest of uninspired men has not hesitated to declare the dog a great mystery, on account of this dawning of a moral nature unaccompanied by any the least evidence of reason, in whichever of the two senses we interpret the word—whether as the practical reason, that is, the power of proposing an ultimate end, the determinability of the Will by ideas; or as the sciential reason, that is, the faculty of concluding universal and necessary truths from particular and contingent appearances.