§2. But here a word of caution seems required, which has been somewhat anticipated in earlier chapters, but on which it is particularly needful to lay stress at this point of our discussion: against a certain class of sham-axioms, which are very apt to offer themselves to the mind that is earnestly seeking for a philosophical synthesis of practical rules, and to delude the unwary with a tempting aspect of clear self evidence. These are principles which appear certain and self-evident because they are substantially tautological: because, when examined, they are found to affirm no more than that it is right to do that which is---in a certain department of life, under certain circumstances and conditions---right to be done. One important lesson which the history of moral philosophy teaches is that, in this region, even powerful intellects are liable to acquiesce in tautologies of this kind; sometimes expanded into circular reasonings, sometimes hidden in the recesses of an obscure notion, often lying so near the surface that, when once they have been exposed, it is hard to understand how they could ever have presented themselves as important.
Let us turn, for illustration's sake, to the time-honoured Cardinal Virtues. If we are told that the dictates of Wisdom and Temperance may be summed up in clear and certain principles, and that these are respectively,
The definitions quoted may be found in modern writers: but it seems worthy of remark that throughout the ethical speculation of Greece, such universal affirmations as are presented to us concerning Virtue or Good conduct seem almost always to be propositions which can only be defended from the charge of tautology, if they are understood as definitions of the problem to be solved, and not as attempts at its solution. For example, Plato and Aristotle appear to offer as constructive moralists the scientific knowledge on ethical matters of which Socrates proclaimed the absence; knowledge, that is, of the Good and Bad in human life. And they seem to be agreed that such Good as can be realised in the concrete life of men and communities is chiefly Virtue,---or (as Aristotle more precisely puts it) the exercise of Virtue: so that the practical part of ethical science must consist mainly in the knowledge of Virtue. If, however, we ask bow we are to ascertain the kind of conduct which is properly to be called Virtuous, it does not seem that Plato can tell us more of each virtue in turn than that it consists in (1) the knowledge of what is Good in certain circumstances and relations, and (2) such a harmony of the different elements of man's appetitive nature, that their resultant impulse may be always in accordance with this knowledge. But it is just this knowledge (or at least its principles and method) that we are expecting him to give us: and to explain to us instead the different exigencies under which we need it, in no way satisfies our expectation. Nor, again, does Aristotle bring us much nearer such knowledge by telling us that the Good in conduct is to be found somewhere between different kinds of Bad. This at best only indicates the whereabouts of Virtue: it does not give us a method for finding it.
On the Stoic system, as constructed by Zeno and Chrysippus, it is perhaps unfair to pronounce decisively, from the accounts given of it by adversaries like Plutarch, and such semi-intelligent expositors as Cicero, Diogenes Laertius, and Stobæus. But, as far as we call judge of it, we must pronounce the exposition of its general principles a complicated enchainment of circular reasonings, by which the inquirer is continually deluded with an apparent approach to practical conclusions, and continually led back to the point from which he set out.
The most characteristic formula of Stoicism seems to have been that declaring `Life according to Nature' to be the ultimate end of action. The spring of the motion that sustained this life was in the vegetable creation a mere unfelt impulse: in animals it was impulse accompanied with sensation: in man it was the direction of Reason, which in him was naturally supreme over all merely blind irrational impulses. What then does Reason direct? `To live according to Nature' is one answer: and thus we get the circular exposition of ethical doctrine in its simplest form. Sometimes, however, we are told that it is `Life according to Virtue': which leads us into the circle already noticed in the Platonic-Aristotelian philosophy; as Virtue, by the Stoics also, is only defined as knowledge of Good and Bad in different circumstances and relations. Indeed, this latter circle is given by the Stoics more neatly and perfectly: for with Plato and Aristotle Virtue was not the sole, but only the chief content of the notion Good, in its application to human life: but in the view of Stoicism the two notions are absolutely coincident. The result, then, is that Virtue is knowledge of what is good and ought to be sought or chosen, and of what is bad and ought to be shunned or rejected: while at the same time there is nothing good or properly choice-worthy, nothing bad or truly formidable, except Virtue and Vice respectively. But if Virtue is thus declared to be a science that has no object except itself, the notion is inevitably emptied of all practical content. In order, therefore, to avoid this result and to reconcile their System with common sense, the Stoics explained that there were other things in human life which were in a manner preferable, though not strictly good, including in this class the primary objects of men's normal impulses. On what principle then are we to select these objects when our impulses are conflicting or ambiguous? If we can get an answer to this question, we shall at length have come to something practical. But here again the Stoic could find no other general answer except either that we were to choose what was Reasonable, or that we were to act in accordance with Nature: each of which answers obviously brings us back into the original circle at a different point.
In Butler's use of the Stoic formula, this circular reasoning seems to be avoided: but it is so only so long as the intrinsic reasonableness of right conduct is ignored or suppressed. Butler assumes with his opponents that it is reasonable to live according to Nature, and argues that Conscience or the faculty that imposes moral rules is naturally supreme in man. It is therefore reasonable to obey Conscience. But are the rules that Conscience lays down merely known to us as the dictates of arbitrary authority, and not as in themselves reasonable? This would give a surely dangerous absoluteness of authority to the possibly unenlightened conscience of any individual: and Butler is much too cautious to do this: in fact, in more than one passage of the Analogy he expressly adopts the doctrine of Clarke, that the true rules of morality are essentially reasonable. But if Conscience is, after all, Reason applied to Practice, then Butler's argument seems to bend itself into the old circle: `it is reasonable to live according to Nature, and it is natural to live according to Reason.'
In the next chapter I shall have to call attention to another logical circle into which we are liable to slide, if we refer to the Good or Perfection, whether of the agent or of others, in giving an account of any special virtue; if we allow ourselves, in explaining Good or Perfection, to use the general notion of virtue (which is commonly regarded as an important element of either). Meanwhile I have already given, perhaps, more than sufficient illustration of one of the most important dangers that beset the students of Ethics. In the laudable attempt to escape from the doubtfulness, disputableness, and apparent arbitrariness of current moral opinions, he is liable to take refuge in principles that are incontrovertible but tautological and insignificant.