{In whom} (en h(9369)). This locative form can refer to
must(8872)iou or to Christou. It really makes no difference in
sense since Christ is the mystery of God. {All the treasures of
wisdom and knowledge} (pantes hoi th(8873)auroi t(8873) sophias kai
gn(9373)e(9373)). See on 烘t 2:11; 6:19-21| for this old word, our
thesaurus, for coffer, storehouse, treasure. Paul confronts these
pretentious intellectuals (Gnostics) with the bold claim that
Christ sums up all wisdom and knowledge. These treasures are
hidden (apokruphoi, old adjective from apokrupt(935c), to hide
away,  Mr 4:22 ) whether the Gnostics have discovered them or
not. They are there (in Christ) as every believer knows by fresh
and repeated discovery.