{Inasmuch} (katho). "In so far forth as" ("according to
which thing"), old conjunction, in N.T. only here and  2Co 8:12  Ro 8:26 . {Ye are partakers of} (koin(936e)eite). Present active
indicative of koin(936e)e(935c), old verb (from koin(936e)os, partner), to
share in either with genitive ( Heb 2:14 ) or dative as here
(path(886d)asin). {That ye may rejoice with exceeding joy} (hina
char(8874)e agalli(936d)enoi). Purpose clause with hina and second
aorist passive subjunctive of chair(935c), with the present middle
participle of agallia(935c) to exult ( 1:8 ), "that ye may rejoice
exulting." See  1:6-8  for this same idea associated with the
second coming of Christ as here.