In cooperation of this type the aspirants are in a way serving each other because the Master’s work is accepted by them all as their own. And in being useful to a fellow aspirant in doing the Master’s work, the aspirant is rendering a service to him as much as to the Master. In such service there can be no bossing because the aspirant is always conscious that it is the Master’s work, which he has accepted as his own, that he is doing. He further knows that, as aspirants, they are all equal; and it is easy for him to cultivate the habit of serving in the spirit of utter humility. If service makes him proud, he might as well not have served. One of the most difficult things to learn is to render service without bossing, without making a fuss about it, and without any consciousness of high and low. In the world of spirituality, humility counts at least as much as utility.
-Discourses 7th Ed. p364