"Why" in Psalms 78:67-68

Psalm 78:67‑68
Answer: God is sovereign, or He abdicates Godhead. One of the twelve tribes must of necessity take precedence; and He chose Judah. If any creature is entitled to ask “why,” surely it is a very plain answer that His Son deigned to be born of that tribe. But it is well to be content with God’s wise, good, and holy will, if we could give no reason.