12. we … received, not … spirit of … world—the personal evil "spirit that now worketh in the children of disobedience" (Eph 2:2). This spirit is natural in the unregenerate, and needs not to be received.
Spirit which is of God—that is, which comes from God. We have received it only by the gift of God, whose Spirit it is, whereas our own spirit is the spirit that is in us men (1Co 2:11).
that we might know … things … freely given … of God—present experimental knowledge, to our unspeakable comfort, of His deep mysteries of wisdom, and of our future possession of the good "things which God hath prepared for them that love Him" (1Co 2:9).