Atzilus and the Absence of Evil

The spiritual world of 'Atzilus' is a world of absolute unity about which the Possuk לֹא יְגֻרְךָ רָּע “Evil does not abide with you”, that not only is there no actual evil there, but furthermore, evil could not possibly exist there.

Whereas, unlike the spiritual worlds of 'Briyah, Yetzirah and Asiyah' even the world of 'Briyah' has within it an existence of evil, except that it is mostly good and only a tiny bit evil. This means that the evil is subservient to the good (and therefore we find that the spiritual world of 'Briyah' is sometimes referred to as the 'stopped up worlds') and yet, since some evil exists within it there is always the possibility that from it will emanate a nurture to the external forces etc.