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I forgot one thing: to hear it you must be absolutely sincere, for if you are not sincere, you will begin by deceiving yourself and you will hear nothing at all except the voice of your ego and then you will commit with assurance (thinking that it is the real small voice) the most awful stupidities. But if you are sincere, the way is sure. It is not even a voice, not even a sensation, it is something extremely subtle—a slight indication. When everything goes well, that is, when you do nothing contrary to the divine Will, you will not perhaps have any definite impression, everything will seem to you normal. Of course, you should be eager to know whether you are acting in accordance with the divine Will, that is the first point, naturally, without which you can know nothing at all. But once you are eager and you pay attention, everything seems to you normal, natural, then all of a sudden, you feel a little uneasiness somewhere in the head, in the heart or even in the stomach—generally one doesn't give it a thought; you may feel it several times in the day but you reject it without giving it any attention; but it is no longer quite the same; then, at that moment, you must stop, no matter what you may be doing, and look, and if you are sincere, you will notice a small black spot (a tiny wicked idea, a tiny false movement, a small arbitrary decision) and that's the source of the uneasiness. You will notice then that the little black spot comes from the ego which is full of preferences; generally it does what it likes; the things it likes are called good and those it does not are called bad—this clouds your judgment. It is difficult to judge under these conditions. If you truly want to know, you must draw back a step and look, and you will know then that it is this small movement of the ego which is the cause of the uneasiness. You will see that it is a tiny thing curled back upon itself; you will have the impression of being in front of something hard which resists or is black. Then with patience, from the height of your consciousness, you must explain to this thing its mistake, and in the end it will disappear. I do not say that you will succeed all at once the very first day, but if you try sincerely, you will always end with success. And if you persevere, you will see that all of a sudden you are relieved of a mass of meanness and ugliness and obscurity which was preventing you from flowering in the light. It is those things which make you shrivel up, prevent you from widening yourself, opening out in a light where you have the impression of being very comfortable. If you make this effort, you will see finally that you are very far from the point where you had begun, the things you did not feel, did not understand, have become clear. If you are resolved, you are sure to succeed. <ref>http://incarnateword.in/cwm/04/8-february-1951#p18</ref>

The greatest enemies of a perfect sincerity are preferences (either mental, vital or physical) and preconceived ideas. It is these obstacles that must be overcome.