Lo Lishma means that I’m aware of the fact that I exist in egoism rather than bestowal. I strive to achieve bestowal, Lishma, with all my might, but I’m yet unable to do it and must make a calculation in my own interest. The difference I see between my actual and desired states is called my Lo Lishma.
Suppose you hand me an envelope, returning a loan of one thousand dollars. If I take the envelope without checking what’s inside, this is called “below reason.” That is, I take you at your word from the outset and don’t involve any reason. If I check it, see exactly one thousand dollars, and accept the repayment, this is called “within reason.”
However, if I open the envelope, count the money, and see that it’s short by a certain amount, but nonetheless accept it as full repayment of the loan, to the measure of the missing sum, I work in faith above reason.
From the 1st part of the Daily Kabbalah Lesson 6/19/2011, Writings of Rabash