Question: Why does it say, “from the end of the world to its end,” and not “from the beginning of the world to its end”?
Answer: In our perception, we exist between the attributes of judgment and mercy, between the two lines. Our entire world “fits” between the forms of these borders.
Hence, in a given context, we cannot see the world from the beginning to the end. In each state the world is limited by the bounds of our Kli (vessel), which we are able to detect.
From the 1st part of the Daily Kabbalah Lesson 10/29/10, The Zohar, Introduction, “The Rose”