Holy Zohar text. Daily Zohar -52.

No prophet, seer or wise can achieve spiritual understanding without connecting the Torah in completion with Malchut. In the secret of Zot, Meaning ‘this’, זאת.
Notice the letter combinations ז = 7 and 7 sefirot of the lower levels and את are the first and last letters of the Alef Bet, which represent the act of creation.
Also the first two letters זא abbreviation for Zeir Anpin and ת is the last letter of the Alef-Bet and of Malchut, מלכות.
Jacob received it and taught it to his sons (Genesis 49:28).
King David became a chariot to Malchut with this connection (Psalms 27:3).
Aaron connect to Zot when serving in the Tabernacle (Leviticus 16:3)
The final redemption will be with Zot זאת. (Lamentation 3:21) “ I will return Zot to my heart…”. The numerical value of Zot is 408 and heart is the Torah (heart = 32 ) with a total number of foundation letters in the Torah 599592 it comes up to perfect 600,000 as the number of souls that left Egypt and received the Torah on Mount Sinai.

Zot, which also referred to as the Shechina and when connected to Zeir Anpin, which is the Torah will create the completion of upper and lower described by the Zohar and needed to create the final chariot for Mashiach.

Read more about 600,000 here: http://kabbalahsecrets.com/?p=110

מקור הקטע: הקדמת תיקוני הזוהר עם פרוש מעלות הסולם (רבי יהודה צבי ברנדויין זל) פסקה 253