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Seven times a day do I praise You [G-d], due to Your righteous ordinances.
What is the meaning of this?
In the morning; one recites two blessings before the Shema, and one after it = 3 benedictions
In the evening; on recites two before it and two after it = 4 benedictions
3 + 4 = 7 praises/blessings
Divrei Hayamim Chronicles I, chapter 29:11:
Yours, O Lord, are 1/ the greatness, 2/ and the might, 3/ and the glory, 4/ and the victory, 5/ and the majesty, for all that is in the heavens and on the earth [is Yours]; 6/ Yours is the kingdom and [You are He] Who is 7/ exalted over everything as the Leader.
The 7 expressions of exaltation above correspond to the 7 / 10 Sefirot (divine channels or attributes in the divine/Kabbalistic tree of life) as follows:
1/ Greatness / Chessed – loving kindness (Abraham, our forefather)
2/ Might / Discipline / Judgement – Din / Gevura (Isaac, our forefather)
3/ Glory / Truth - Tiferet (Jacob or Israel, our forefather)
4/ Victory / Eternity - Netzach (Moses, our victorious leader)
5/ Majesty / Priesthood – Hod (Aaron, the priest)
6/ Kingdom / Divine Presence – Malkhut / Shekhina (David, the king / Kingdom of the messiah)
7/ Exaltation – Yesod (Joseph, who was exalted over his brothers)
Alternatively, attribute 7/ Yesod - embraces all the remaining 3 attributes of Keter (Crown), Chokhma (Knowledge / Wisdom), and Bina (understanding).
Conclusion:
King David and our sages fixed our prayers with Ruach Hakodesh (divine inspiration), and there is nothing by coincidence in Judaism – it all fits together in a divine jigsaw puzzle.

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