משך חכמה — והייתם לי סגולה מכל העמים

Q — What is the ultimate purpose of Israel being a "סגולה" — and why is this followed immediately by "כי לי כל הארץ"?

A — The nations partially recognize Hashem but never fully, because they see Israel oppressed; if Israel were openly saved and exalted, all the nations would abandon their idols and unite in recognizing Hashem ("הללו את ה' כל גוים"). So there is a chain: Israel's RUCHANIYUT → Israel's GASHMIYUT → the nations' RUCHANIYUT. "תהיו לי סגולה" therefore leads to "לי כל הארץ" — Israel's elevation is the conduit through which all the world comes to recognize Hashem.