Matthew 21:42

Jesus saith unto them, Did ye never read the scriptures, The stone which the builders rejected, The same was made the head of the corner; This was from the Lord, And it is marvelous in our eyes?

Christ quoted Psalms 118:22ff. The example of a rejected stone becoming the chief stone was founded on historical fact. Dean Plumptre said:

The illustration seems to have been drawn from one of the stones, quarried, hewn, and marked, away from the site of the temple, which the builders, ignorant of the head architect's plans, had put to one side, as having no place in the building, but which was found afterwards to be that on which the completeness of the structure depended, that on which, as the chief cornerstone, the two walls met, and were bonded together.[4]

Christ as the Cornerstone suggests that: (1) law and grace; (2) God and man; (3) time and eternity; (4) B.C. and A.D.; (5) the Mosaic dispensation and the Christian dispensation; (6) the letter and the spirit; and (7) judgment and mercy, both begin and end, thus forming, in a metaphor, a true corner in him!

Following a little further the analogy of a rejected stone, we note that David, the despised one of Jesse's sons, was raised to be the king of Israel; Zerubbabel was despised, but it was he who began and finished the building (Zechariah 4:7-10).