AUTOI appears to be a nominative form used in a vocative sense here.
The use of AUTOS in stead of hUMEIS (from SU) to indicate emphasis. See BAGD,
s.v. AUTOS, sect. 2.
-- David L. Moore Director Miami, Florida, USA Department of Education firstname.lastname@example.org Southeastern Spanish District http://www.netcom.com/~dvdmoore of the Assemblies of God