But the minds of the Israelites became dull for, to this very day, the same veil remains on them [i.e., figuratively] when the Old Agreement [Scriptures] are read. It is not being revealed to them that the Old Agreement is being abolished by Christ [i.e., by His death on the cross. See Col. 2:14].

But we have this treasure [i.e., the Gospel message] in clay pots [i.e., the mortal bodies of the apostles] to show that the [i.e., its] extraordinary power comes from God and not from us.

But, so that I would not become too conceited over the tremendous revelations [I received], a "thorn in the flesh" was given to me as a messenger from Satan to torment me. [Note: This "thorn" was probably some physical handicap, possibly defective eyesight. See Gal. 4:14-15; 6:11].