Answer: Kabbalists and people who tried to understand them say that the wisdom of Kabbalah is a science. The wisdom of Kabbalah meets all the criteria according to which we define science rather than a doctrine.
A doctrine doesn’t rely on facts. It is a synthesis of ideas and assumptions that a person acquires by experience, but in any case not facts; it is not clear, accurate documentation according to the rule: “a judge has only what his eyes can see,” of observations and measurements of our world to the extent that something is revealed to him.
A Kabbalist is a person who has developed extra senses by which he explores nature more deeply than others. He explores the level of nature where the forces of the leadership are, the plan and the data of the leadership of our world, and it is a reality for him. He attains it in an absolutely accurate manner, records and builds it. The world he is in is no less real for him than our world, and so he considers his studies of the upper world scientific research and himself a scientist.
Moreover, Kabbalists claim that the wisdom of Kabbalah meets all the requirements and the definitions of a science, more than all the other sciences because it explores nature in its real form—not in the narrow framework we receive in some confusion of a range of influences, reflections, refractions of our understandings and feelings, and out of our impact on the environment.
Now we perceive the world only through our five senses or by instruments that expand their range of perception a bit, whereas Kabbalists perceive nature in its absolute form, because they develop abilities of exiting themselves, by ascending their egoism, which distorts the ability to understand nature by our egoistic feelings and mind; they become true researchers, scientists, who outperform the scientists of our world.
From the Kabbalah Lesson in Russian 1/17/16