II.  The Letters, of which two hundred and forty-three are extant, are characterised by a clear, concise, and pleasant style and spirit.  Some of them treat of the theological questions of the day, as for example the two to Cledonius, and one to Nectarius his Successor in the See of Constantinople; these deal with the Apollinarian errors.  Most of them however are letters to private friends; sometimes of condolence or congratulation, sometimes of recommendation, sometimes on mere general subjects of interest.  To this section must be ascribed his Will, which is probably genuine.