Answer: There can be no doubts in Kabbalah. Rising above them, we come to the spiritual quality of bestowal, the quality of faith, and there is no room for doubt in it because there we reveal the Creator, the upper Light.
Faith in the spiritual is the feeling of the Creator. And the spiritual quality of faith is the complete opposite of the material where you close your eyes and imagine that this is so.
In Kabbalah, on the contrary, you open your eyes and begin to see.
From the Kabbalah Lesson in Russian 12/10/17