{And who is he that overcometh?} (	is estin de ho nik(936e)?).
Not a mere rhetorical question ( 2:22 ), but an appeal to
experience and fact. Note the present active articular participle
(
ik(936e)) like 
ik(8369) (present active indicative in verse  4 ),
"the one who keeps on conquering the world." See  1Co 15:57  for
the same note of victory (
ikos) through Christ. See verse  1 
for ho pisteu(936e) (the one who believes) as here. {Jesus is the
Son of God} (I(8873)ous estin ho huios tou theou). As in verse  1 
save that here ho huios tou theou in place of Christos and
see both in  2:22f . Here there is sharp antithesis between
"Jesus" (humanity) and "the Son of God" (deity) united in the one
personality.