  Building on this account of probable impressions, Carneades defended two views about assent. According to one proposal, the wise person will always withhold assent, but will be able to act and inquire by following or using probable impressions in a way that does not amount to assent, and so does not involve holding opinions about anything (Acad. 2.59, 99, 108). According to the second, the wise person will assent to what is probable and so form opinions, but provisionally and on the understanding that he may be wrong (Acad. 2.59, 67, 78, 112).