Hebrew, “knowledge.” Da’at is the uppermost of the Sefirot of the Left line or kav smol (Hebrew for left line), the line severity in the Tree of Life. It is associated with memory and concentration, powers which rely upon one’s recognition.
In the Zohar, Da’at is referred to as “the key that includes six.” This “key” opens all six attributes of the heart. Combining with Chokhmah (Hebrew, “wisdom”) creates Binah (Hebrew, “understanding”). Knowledge may be gained by all, and wisdom may be obtained as well. Only by combining the two, through Christ’s grace and the Holy Spirit can we see with our third eye and gain true understanding. With the knowledge of God, and the six attributes open, our kli spills God’s light into the invisible Sefirot, Binah (understanding) and into the world.
Da’at helps us then on two levels: the lower level (mundane) and the higher level, Da’at Elyon (Hebrew for higher knowledge) or Da’at hane’elam (Hebrew for hidden knowledge).
The lower connects us to the intellect within the realm of emotion. This enhances one’s ability to act in accordance with the Law in truth and righteousness. The higher knowledge helps us on the mortal plain by giving us hidden knowledge from Keter, above Da’at on the Tree.
See Book of Remembrance 1:20-21, 29:7-8, 33:9-12.