Answer: This world is not an illusion. It absolutely and clearly exists and must be treated as a reality. When it gradually begins to disappear from your sensation you can say that it is illusory. The wisdom of Kabbalah relates to everything materialistically.
Question: Does this world become an illusion for a Kabbalist? What does existence in two worlds mean?
Answer: For a Kabbalist, this world is not an illusion. I exist in this world. I have a wife, children, grandchildren, friends, students, and my egoism that I am working on. Existence in two worlds becomes possible when a Kabbalist, in addition to his egoism with which he was born and which has developed in this state, acquires additional possibilities for investigating the extent of creation found outside of the ego.