{Believe in the light} (pisteuete eis to ph(9373)). That is,
"believe in me as the Messiah" ( 8:12  9:5 ). {That ye may become
sons of light} (hina huioi ph(9374)os gen(8873)the). Purpose clause
with hina and second aorist subject of ginomai, to become.
They were not "sons of light," a Hebrew idiom (cf.  17:12  Lu
16:8  with the contrast), an idiom used by Paul in  1Th 5:5  Eph
5:8 . It is equivalent to "enlightened men" (Bernard) and Jesus
called his disciples the light of the world ( Mt 5:14 ). {Hid
himself from them} (ekrub(8820)ap' aut(936e)). Second aorist passive
indicative of krupt(935c), late form (in LXX) for old ekruph(885c),
"was hidden from them," as in  8:59 . This part of verse  36 
begins a new paragraph.