It is indeed a stark reminder that the natural, unregenerate man cannot receive the things of the spirit. (1st Cor 2:14) To the "Pharisees" it seems only natural for them to try to establish their own righteousness (Rom 10:3) not realizing they do not have even one iota of anything to offer God, not even the tiniest thing. Heaven will be filled with horrible people. People who were so horrible, that they fled to the Savior for forgiveness. Henceforth there is laid up for me a crown of righteousness, which the Lord, the righteous judge, will give to me on that day, and not to me only, but unto all them also that love His appearing. (2 Tim 4:8) I can't help but feel that as people see us, to the one we are the savor of death unto death; and to the other the savor of life unto life. (2 Cor 2:16) I know you are all older than me, :-) but hang in there. It won't be long till we all be together, where we will all join in, as every member of Adam's race, every creature that has ever uttered a sound, will, all in one great chorus, rise up and proclaim that Jesus Christ is Lord, to the Glory of God the Father (Phil 2:10-11) Maranatha brothers.
A beautiful Bible study even in its brevity!