Religion has to do with the real, and the real is the particular; theology has to do with what is notional, and the notional is the general and systematic. Hence theology has to do with the Dogma of the Holy Trinity as a whole made up of many propositions; but Religion has to do with each of those separate propositions which compose it, and lives and thrives in the contemplation of them. In them it finds the motives for devotion and faithful obedience; while theology on the other hand forms and protects them by virtue of its function of regarding them, not merely one by one, but as a system of truth.****
There are those, who, arguing à priori, maintain, that, since experience leads by syllogism only to probabilities, certitude is ever a mistake. There are others, who, while they deny this conclusion, grant the à priori principle assumed in the argument, and in consequence are obliged, in order to vindicate the certainty of our knowledge, to have recourse to the hypothesis of intuitions, intellectual forms, and the like, which belong to us by nature, and may be considered to elevate our experience into something more than it is in itself. Earnestly maintaining, as I would, with this latter school of philosophers, the certainty of knowledge, I think it enough to appeal to the common voice of mankind in proof of it. That is to be accounted a normal operation of our nature, which men in general do actually instance. That is a law of our minds, which is exemplified in action on a large scale, whether à priori it ought to be a law or no. Our hoping is a proof that hope, as such, is not an extravagance; and our possession of certitude is a proof that it is not a weakness or an absurdity to be certain.
(Chapter 10, Section 1)
Conscience is a personal guide, and I use it because I must use myself; I am as little able to think by any mind but my own as to breathe with another's lungs. Conscience is nearer to me than any other means of knowledge. And as it is given to me, so also is it given to others; and being carried about by every individual in his own breast, and requiring nothing besides itself, it is thus adapted for the communication to each separately of that knowledge which is most momentous to him individually,—adapted for the use of all classes and conditions of men, for high and low, young and old, men and women, independently of books, of educated reasoning, of physical knowledge, or of philosophy. Conscience, too, teaches us, not only that God is, but what He is; it provides for the mind a real image of Him, as a medium of worship; it gives us a rule of right and wrong, as being His rule, and a code of moral duties. Moreover, it is so constituted that, if obeyed, it becomes clearer in its injunctions, and wider in their range, and corrects and completes the accidental feebleness of its initial teachings. Conscience, then, considered as our guide, is fully furnished for its office. I say all this without entering into the question how far external assistances are in all cases necessary to the action of the mind, because in fact man does not live in isolation, but is everywhere found as a member of society; I am not concerned here with abstract questions.