A vision of the future from the prophet Zechariah
And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for his only son, and shall be in bitterness for him, as one that is in bitterness for his firstborn.
Zechariah 12:10
The Scriptures are clear in both Old Testament and New, Messiah will come, and, the New Testament makes clear He will come again. When Jesus came His own people received him not, and Zechariah's vision tells us that when He, Jesus, Messiah, comes again His people will look at Him and will recognize Him who was pierced. I don't know if it will be the spear wound in His side or the nail prints, but His people will know Jesus is Messiah. After all the years they will mourn for Him. I don't know, but they might say something like, "Why didn't we recognize who He was the first time?" A question that all people of the world could ask as well.