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.”[172] 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.”