Answer: The eye of the needle is not an entrance even though we call it so. This is our readiness for work, readiness to accept everything that comes from Above.
The needle’s eye is first of all the needle itself. It’s not just a tiny opening. This means that I am ready for everything that the Creator is doing with me since His every action over me is very painful and opposite to my desire to receive pleasure.
Therefore, one has to advance to it very slowly and gradually. A person allows the upper Light a possibility to act to the degree of his readiness, to at least in some external form to come out of himself, from his ego, and to become closer to others.
This is why we are given a group. When you are able in some way to connect to your friends, the Light will act upon you and you will feel that you are capable of tolerating this. This breakaway from oneself elevates the person as he overcomes his ego.
From the 2nd part of the Daily Kabbalah Lesson 1/17/12, The Zohar