Colossians 2:3

“In whom are hid all the treasures of wisdom and knowledge.] This may be understood either of the mystery of the Gospel, which contains the rich mines and hidden treasures of all divine truths; so called, because of the richness and intrinsic value and excellency of them; and because of their variety and abundance, being the unsearchable riches of Christ: or of Christ himself; and not so much of his personal wisdom, either as God, being the all-wise God, the wisdom of God, an omniscient Being, that knows all persons and things whatever, within the whole circle of wisdom and knowledge; or as man, whose wisdom and knowledge, though created, was very large and abundant; or as Mediator, on whom…”

“Translate in the Greek order, "In whom (not as ALFORD, 'in which') mystery; Christ is Himself the 'mystery' (Col 2:2; Ti1 3:16), and to Christ the relative refers) are all the treasures of wisdom and knowledge hidden." The "all" here, answers to "all" in Col 2:2; as "treasures" answer to the "riches"; it is from the treasures that the riches (Col 2:2) are derived. "Are" is the predicate of the sentence; all the treasures ARE in Him; hidden is predicated of the state or manner in which they are in Him. Like a mine of unknown and inexhaustible wealth, the treasures of wisdom are all in Him hidden, but not in order to remain so; they only need to be explored for you to attain "unto the riches"…”

“In whom - Margin, “wherein.” The more correct translation is “in whom.” The reference is doubtless to Christ, as his name is the immediate antecedent, and as what is affirmed here properly appertains to him. Are hid - Like treasures that are concealed or garnered up. It does not mean that none of those “treasures” had been developed; but that, so to speak, Christ, as Mediator, was the great treasure-house where were to be found all the wisdom and knowledge needful for people. All the treasures - It is common to compare any thing valuable with “treasures” of silver or gold. The idea here is, that in reference to the wisdom and knowledge needful for us, Christ is what abundant treasures are in…”

“2:3 Paul builds on 1:15-20: Christ alone is sufficient for our spiritual understanding.”

“In whom: or, Wherein, Col 1:9, Col 1:19, Col 3:16; Rom 11:33; Co1 1:24, Co1 1:30, Co1 2:6-8; Eph 1:8, Eph 3:10; Ti2 3:15-17 hid: Col 3:3; Job 28:21; Pro 2:4; Mat 10:26; Eph 3:9; Rev 2:17 Colossians 2:4”