Sentence:  In order to clarify the practical conditions of felicity of the scientific life, we might also reverse the view of Callicles, who only values the <WSD>agoraphilia</WSD> of the politician or rhetoretician, and take positively his list of negatives: that philosophy is something for children, not for mature grown-ups, that philosophers lack practical experience, play games, do not know how to address public meetings: in sum, that they are impractical, strange, other-worldly. 
Meaning of the word marked with <WSD> tags:  The love of public life, crowds, and activity.