'Acquainted' in the Bible

for I made the decision to know nothing [that is, to forego philosophical or theological discussions regarding inconsequential things and opinions while] among you except Jesus Christ, and Him crucified [and the meaning of His redemptive, substitutionary death and His resurrection].

For, among human beings, who knows a man's inner thoughts except the man's own spirit within him? In the same way, also, only God's Spirit is acquainted with God's inner thoughts.

But the natural [unbelieving] man does not accept the things [the teachings and revelations] of the Spirit of God, for they are foolishness [absurd and illogical] to him; and he is incapable of understanding them, because they are spiritually discerned and appreciated, [and he is unqualified to judge spiritual matters].

If anyone imagines that he knows and understands anything [of divine matters, without love], he has not yet known as he ought to know.