And whosoever shall fall on this Stone shall be broken:
but on whomsoever it shall fall, it will grind him to powder. Matthew 21:44
What stone could it be talking about?
They are talking about Jesus, the Chief Cornerstone, the Messiah who is the foundation of our faith.
As with all scriptures, this one has both surface and in-depth meanings. On the surface, it is talking about humbling yourself before the Lord or He will humble you. It also has a deeper meaning of who Christ is and His kingdom as is apparent in Daniel and Acts and 1 Peter and Psalms and many other scriptures that refer to the Cornerstone.
For this post, we are going to keep it simpler, about humility before the Lord.
Humble yourselves therefore under the mighty hand of God, that He may exalt you in due time. 1 Peter 5:6
There will be a time when those who have refused to humble themselves before the Lord will say to the rocks fall on us and hide us from the wrath of the Lord:
And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake;
and the sun became black as sackcloth of hair, and the moon became as blood;
And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs,
when she is shaken of a mighty wind.
And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places.
And the kings of the earth, and the great men, and the rich men, and the chief captains,
and the mighty men, and every bondman, and every free man,
hid themselves in the dens and in the rocks of the mountains;
And said to the mountains and rocks,
Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb:
For the great day of His wrath is come; and who shall be able to stand? Revelation 6:12-16
Those who refuse to acknowledge Christ as Lord will one day suffer the consequences of their refusal.
They have warnings and opportunities to humble themselves before Him. I do not know when those opportunities come to each person, none of us do. We only know what happens to us. Each person will give account for his or her life and choices regarding Jesus the Messiah.
it will not be a good day for those who have refused Him when He returns to the Earth.
They will then be greatly humbled.