1. Arcesilaus

Arcesilaus kept to the abstraction of the Idea as against the criterion; for though in the Idea of Plato, i.e. in the Timæus and in his dialectic, the concrete was derived from quite another source, this was only admitted for the first time later on by the Neo-platonists, who really recognized the unity of the Platonic and the Aristotelian principles. The opposition to the Dogmatists thus does not in the case of Arcesilaus proceed from the dialectic of the Sceptics, but from keeping to abstraction; and here we perceive the gulf marking out this epoch from any other.

Arcesilaus was born at Pitane in Æolia in the 116th Olympiad (318 B.C.), and was a contemporary of Epicurus and Zeno. Though he originally belonged to the Old Academy, yet the spirit of the time and the progressive development of Philosophy did not now admit of the simplicity of the Platonic manner. He possessed considerable means, and devoted himself entirely to the studies requisite for the education of a noble Greek, viz. to rhetoric, poetry, music, mathematics, &c. Mainly for the purpose of exercising himself in rhetoric, he came to Athens, here was introduced to Philosophy, and lived henceforth for its sake alone; he held intercourse with Theophrastus, Zeno, &c., and it is a subject of dispute whether he did not hear Pyrrho also. Arcesilaus, familiar with all the Philosophy of those days, was by his contemporaries held to be as noble a man as he was a subtle and acute philosopher; being without pride in himself, he recognized the merits of others. He lived in Athens, occupied the post of scholarch in the Academy, and was thus a successor of Plato. After the death of Crates, the successor of Speusippus, the place of honour in the Academy devolved on Sosicrates, but he willingly gave it up in favour of Arcesilaus on account of the superiority of the latter in talent and philosophy. What really happened as regards the transference of the chair to others, is, for the rest, unknown to us. He filled this office, in which he made use of the method of disputation, with approbation and applause, until his death, which took place in Olympiad 134, 4 (244 B.C.), in the seventy-fourth year of his age.

The principal points in the philosophy of Arcesilaus are preserved by Cicero in his Academics Quæstiones, but Sextus Empiricus is more valuable as an authority, for he is more thorough, definite, philosophic and systematic.

a. This philosophy is specially known to us as being a dialectic directed against Stoicism, with which Arcesilaus had much to do, and its result, as far as its main principles are concerned, is expressed thus: “The wise man must restrain his approbation and assent.” This principle was called ἐποχή, and it is the same as that of the Sceptics; on the other hand this expression is connected with the principle of the Stoics as follows. Because to Stoic philosophy truth consists in the fact that thought declares some content of existence to be its own, and the conception as comprehended gives its approbation to this content, the content of our conceptions, principles and thoughts undoubtedly appears to be different from thought, and the union of the two, which is the concrete, only arises by means of some determinate content being taken up into the form of thought and thus being expressed as the truth. But Arcesilaus saw this consequence, and his saying that approbation most be withheld is thus as much as saying that by thus taking up the content no truth comes to pass, but only phenomenon; and this is true, because, as Arcesilaus puts it, conception and thought likewise remain apart. Arcesilaus has certainly unthinkingly allowed that this content united to consciousness is a concrete such as was indicated, only he has asserted that this connection merely gives a perception with a good ground, and not what he calls truth. This is called probability, but not quite appropriately; it is a universal set forth through the form of thought, and is only formal, having no absolute truth. Sextus (Pyrrh. Hyp. I. c. 33, § 233) puts this plainly in saying that “Arcesilaus has declared the withholding of approbation in relation to parts, to be a good, but the assenting to parts to be an evil,” because the assent only concerns parts. That is, if thought is to be retained as a universal, it cannot come to be a criterion; and that is the meaning of Arcesilaus when he asks that the wise man should remain at the universal, and not go on to the determinate as if this determinate were the truth.

Sextus Empiricus gives us (adv. Math. VII. 155, 151-153) a more particular explanation of this philosophy, which is preserved to us only as being in opposition to the Stoics. Arcesilaus asserted as against the Stoics, that everything is incomprehensible (ἀκατάληπτα). He thus combated the conception of thought (καταληπτικὴν φαντασίαν), which to the Stoics is the point of most importance and the concrete truth. Arcesilaus further attacked the Stoics thus: “They themselves say that the conception of thought is the mean between scientific knowledge and opinion, the one of which pertains alone to fools and the other alone to wise men; the conception of thought is common to both, and the criterion of the truth. Arcesilaus here argued in such a way as to show that between scientific knowledge and opinion the conception of thought is no criterion, for it is either in the wise man or the fool, and in the former it is knowledge, and in the latter, opinion. If it is nothing excepting these, there remains to it nothing but an empty name.” For knowledge must be a developed consciousness derived from reasons, but these reasons, as conceptions of thought, Arcesilaus states to be just such thoughts as those of the fool. They are thus, no doubt, the concrete directing power which constitutes the principal content of our consciousness; but it is not proved that they are the truth. Thus this mean, as judging between reason and opinion, pertains equally to the wise man and the fool, and may be error or truth equally; and thus the wise man and the fool have the same criterion, and yet they must, in relation to the truth, be distinguished from one another.

Arcesilaus further gives effect to the distinctions which are more particularly brought up in modern times, and relied upon. “If comprehension is the assent given to a conception of thought, it does not exist. For, in the first place, the assent is not on account of a conception, but of a reason; that is to say, it is only as regards axioms that this assent holds good.” That is good; more fully the purport would be something like this: Thought, as subjective, is made to assent to an existence which is a determinate content of the conception. A sensuous image such as this, however, is foreign to thought, and with it thought cannot accord, because it is something different from it, something from which thought, on the contrary, holds itself aloof. It is, in general, only to a thought that thought finds itself conformable, and only in a thought that it finds itself; thus only a universal axiom is capable of such accord, for only such abstract principles are immediately pure thoughts. Arcesilaus thus holds it up against the Stoics that their principle contains a contradiction within itself, because the conception of thought is made to be the thought of another, but thought can only think itself. This is a thought which concerns the inmost essence of the thing. Arcesilaus thus here makes the same celebrated distinction as in recent times has again been brought forward with so much force as the opposition between thought and Being, ideality and reality, subjective and objective. Things are something different from me. How can I attain to things? Thought is the independent determination of a content as universal; but a given content is individual and hence we cannot assent to such. The one is here, the other there; subjective and objective cannot pass to one another—this is a form of thought upon which for long the whole culture of modern philosophy has turned, and which we still find to-day. It is important to have a consciousness of this difference, and to assert this consciousness against the principle of the Stoics. It was of this unity of thought and reality that the Stoics ought to have given an account; and this they did not do, and indeed it was never done in ancient times. For the ancients did not prove that the subjective element of thought and this objective content are really in their diversity the passing into one another, and that this identity is their truth; this was only found in Plato in an abstract form and as a first commencement. The unity of thought and conception is the difficult matter; thus if thought, as such, is the principle, it is abstract. The logic of the Stoics hence remained formal merely, and the attainment of a content could not be demonstrated. Thought and Being are themselves such abstractions, and we may move to and fro between them for long without arriving at any determination. Thus this unity of universal and particular cannot be the criterion. With the Stoics the conception as comprehended appears to be immediately asserted; it is a concrete, but it is not shown that this is the truth of these distinct elements. Against this immediately accepted concrete, the assertion of the difference of the two is thus quite consistent.

“In the second place,” says Arcesilaus, “there is no apprehended conception that is not also false, as has been confirmed many times and oft,” just as the Stoics themselves say that the apprehended conception could be both true and false. Determinate content has its opposite in a determinate which must likewise as an object of thought be true; and this destroys itself. In this consists the blind wandering about in thoughts and reasons such as these, which are not grasped as Idea, as the unity of opposites, but in one of the opposites asserts one thing, and then, with as good reason, the opposite. The truth of the world is, on the contrary, quite different, the universal law of reason which is as such for thought. Reasons are relatively ultimate for a content, but not absolutely ultimate; they can only be regarded as good reasons, as probability, as the Academics express it. This is a great truth which Arcesilaus had attained. But because no unity can thus come forth, he then draws the conclusion that the wise man must withhold his assent, that is, not that he should not think, but that he must not merely for that reason regard as true that which is thought. “For since nothing is comprehensible, he will, if he assents, assent to an incomprehensible; now because such an assent is opinion, the wise man will only be wise in opinion.” We still likewise hear this said: Man thinks, but does not thereby arrive at the truth; it remains beyond. Cicero (Acad. Quæst. IV. 24) thus expresses this: “Neither the false nor the true can be known, if the true were simply to be such as is the false.”

b. In relation to what is practical, Arcesilaus says: “But since the conduct of life without a criterion of the true or the false is impossible, and the end of life, or happiness, can only be determined through such grounds, the wise man, not withholding his approbation regarding everything, will, as regards what has to be done and left undone, direct his actions in accordance with the probable (εὔλογον),” as the subjectively convincing conception. What is right in this is that the good ground does not extend as far as truth. “Happiness is brought about by discretion (φρόνησις), and rational conduct operates in fitting and right action (κατορθώμασι); that is rightly done which is permitted by a well-grounded justification,” so that it appears to be true. “Thus, he who regards what is well-founded will do rightly and be happy,” but for this culture and intelligent thought are requisite. Arcesilaus thus remains at the indeterminate, at subjectivity of conviction, and a probability justified by good grounds. Thus we see that in regard to what is positive, Arcesilaus does not really get any further than the Stoics, nor say anything different from what they do; only the form is different, because, what the Stoics call true, Arcesilaus calls well-founded or probable. But, on the whole, he possessed a higher kind of knowledge than the Stoics, because what is thus founded cannot be held to have the significance of an implicit existence, but only a relative truth in consciousness.