This talk of sin probably makes people feel uncomfortable. After all, who wants to be a sinner? No one wants to open the doors of the heart and stare at the darkness within.
But aspirants forget that this is exactly what we must look at if we open the heart. Opening the heart is not just about letting bliss flow into us and experiencing God's love; before any of that can happen, all the darkness we have taken into the heart and stored there must be purged. This darkness, this sin, is a hidden thing; it is well buried under the ego, and ego only allows us to pick up a corner of the blanket from time to time when it feels like it.
Every once in a while, I am enraged by some perceived slight, the blanket is lifted off and the darkness pours out in all its strengths. That is when I know that there is darkness; yet the darkness has power, and I love power — my ego loves power — so I go with it.
Then come the justifications, rationalizations. There are always reasons for why the darkness is good.
Yet the darkness isn't good; and the parts of me that know what good and what light are know that. I have to look this darkness straight in the eye and confront it in order to be truthful about myself.