There are a number of checks on the path that are completely clear of material signs by which it is possible to evaluate whether you are advancing or not. The first test is whether you strive to feel yourself in the center of the group. Not at the center of everyone’s attention, presenting yourself as the most important, but in the center of the common hopes, in the center of unity, bestowal, and mutual concern, at the very foundation, “on the one leg,” meaning on the pillar on which unity rests: “What is hateful to yourself, don’t do to another.”
First of all, don’t disturb others! That is, restrict yourself to the state of “Tzimtzum Aleph,” as if you do not exist or use your desire to enjoy, so that there will be a place for others beside you, and you yourself will not occupy any place at all, will turn into a zero, like a ghost. You just provide a place for others, like a manager, arranging chairs and taking care so that everyone has a seat. This is called, “What is hateful to yourself, don’t do to another.”
That is, you occupy no place at all but provide it for all the friends. This is the first condition and that is why it is called “standing on one leg.” Indeed, one must stand on this principle and various actions can happen above it, but as a consequence of it. That is why, if you manage to achieve this feeling, getting up in the morning or before each action, this means that you advance in the right direction.
From the Preparation for the Daily Kabbalah lesson 10/16/13