(5) But we speak the wisdom of God in a (g) mystery, [even] the hidden [wisdom], (6) which God ordained before the world unto our glory:
(5) He shows the reason why this wisdom cannot be perceived by those excellent worldly intellects: that is, because it is indeed so deep that they cannot attain to it.
(g) Which men could not so much as dream of. (6) He takes away an objection: if it is so hard, when and how is it known? God, he says, determined with himself from the beginning, that which his purpose was to bring forth at this time out of his secrets, for the salvation of men.