It is inevitable. You will start feeling holier-than-thou. You will start moving like a saint, you will start feeling, exhibiting, that you are not an ordinary mortal, that you are extraordinary, that you are not of this world, that you are transcendental.
And although all these things are right, Atisha says: Please don't brag. He is not saying that you are lying. All these things are true; when awareness happens, miracles start happening. Each moment becomes such a miracle, and you start soaring high, you start attaining to new peaks in everything. Whatsoever you do becomes such a delight, and wherever you move, life appears to be so divine. And you can see too, that wherever you move you bring a certain sacredness to the place. Not that these are lies; these are happening. But if you start bragging, all these things will disappear, because the ego has entered in such a subtle way, and you could not examine it and you could not investigate it.
-Rajneesh