How Did Satan Become Evil?

Q. At the end of Genesis 1, God said everything was “very good”. That statement right there precludes any possibility of evil existing during the creation week.

If everything was made in the presence of God where darkness cannot exist then how could Satan be tempted to be full of pride? in other words, how is it known that the concept of evil/darkness/sin could be chosen over God’s way? or, what would cause Satan to seek out something that he’s not aware of?

A. God didn’t pronounce His work “good” on the second day when He created the Earth’s atmosphere (Gen. 1:7) so not everything of the Creation week was good. 

Ezekiel 28 :15 says  that Satan’s ways were perfect until wickedness was found in  Him. The Hebrew word for wickedness comes from a root meaning “to act wrongfully or unjustly”, so the wickedness was found by observing his actions.  I think this implies that angels as well as men have agency, or free will to choose their behavior.  Although Satan was the first to rebel he was by no means the last.  All of us have the potential for evil.