_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. 2. CARNEADES.