The more you value the upper one, the closer you become to the Light. When you justify the Creator, revere Him, from that height, you get an additional desire (Aviut), the fall. The closer you come to the Light, the greater the intensity with which It works on you.
The effect of the Light is amplified with your approach, by your attempt to get closer, and that is why informational genes (Reshimot) are manifested at a higher rate and have a character closer to the Light, according to your desire.
And on the way, the depth of your desire and negative feelings are revealed to you, but all this is within the same positive trend, although the state may seem quite the opposite. That is why you perform correction even in the darkness.
From the 3rd part of the Daily Kabbalah Lesson 8/27/12, The Study of the Ten Sefirot