34) In section 4, Rabbi Chaim Vital, in his book Etz Chaim, ruled for himself to speak and expound upon matters that existed before and to clarify their main principles. He contemplated providing a reason why the world was created at this particular time and not earlier. He suggested that in ancient times, the Creator was engaged in creating higher worlds and did not complete them until the time of creating this physical world. The Creator did not find a suitable and available time to create this physical world because throughout the duration of the earlier time, He was preoccupied with the creation of the higher worlds. It was necessary to have a specific duration of time for the creation of the world, as mentioned elsewhere.
Vital — The Tree of Life
The Wars of God 4:26