Zechariah 12:10–14 (NKJV)
10 “And I will pour on the house of David and on the inhabitants of Jerusalem the Spirit of grace and supplication; then they will look on Me whom they pierced. Yes, they will mourn for Him as one mourns for his only son, and grieve for Him as one grieves for a firstborn. 11 In that day there shall be a great mourning in Jerusalem, like the mourning at Hadad Rimmon in the plain of Megiddo. 12 And the land shall mourn, every family by itself: the family of the house of David by itself, and their wives by themselves; the family of the house of Nathan by itself, and their wives by themselves; 13 the family of the house of Levi by itself, and their wives by themselves; the family of Shimei by itself, and their wives by themselves; 14 all the families that remain, every family by itself, and their wives by themselves.
While this passage has some eschatological significance, exactly that to which it refers is not certain. Some scholars point to the “Me whom they pierced” as being messianic in nature. Therefore, there could be a connection to the suffering servant passages in Isaiah 53. Others think this is an unidentified person, or perhaps one of many other figures such as King Josiah or a prominent priest (Ralph L. Smith, Micah–Malachi, vol. 32, Word Biblical Commentary (Dallas: Word, Incorporated, 1998), 278.). If we work on the supposition that this is referring to the Messiah, specifically Jesus Christ, then this passage shows that one day all will see the one they pierced, and will mourn over His suffering, and will receive His grace if they repent.
With this understanding of this passage, we see the message of grace brought through the crucified One, Jesus Christ, who came to save all people by His grace. What a glorious message of hope and promise! Jesus saves, and the work of man to destroy Him only fulfills His purpose and brings Him glory. Therefore, let the world pierce Him. Let the scoffers deride His purpose and deity. Jesus came to save sinners, and that work will be fulfilled!