Tanya Chapter 39 part 5

The world of Atzilus is a world of oneness, and it is completely beyond the grasp of a created being. In that sublime world, the ten sefirot are completely unified with their Emanator, and so utterly and infinitely transcend the mind of a limited creature, no matter how great. A created being does indeed possess the ability to grasp chochmah bina and da’at in the lower world of Beriah and still retain existence due to the tzitzum – the constriction – in that world.