Why and When Did Lucifer Fall?

Pride was the main cause for both Satan’s (Lucifer at the time) and mankind’s fall. For that matter, pride seems to be at the center of all sin. After the fall, which we will read about in the next paragraph, Satan was probably jealous that mankind was given dominion over the earth as Genesis 1:26 says “let them have dominion over the fish of the sea and over the birds of the heavens and over the livestock and over all the earth and over every creeping thing that creeps on the earth.” Satan hatched a plan. He would deceive Eve and make her disobey God by taking to eat of the tree of the knowledge of good and evil and Adam would do the same. After this, “And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live forever” (Gen 3:22) and so “the LORD God banished him from the Garden of Eden to work the ground from which he had been taken” (Gen 3:23). Not only were they banished from the Garden of Eden, they would now receive their wages and that was death (Rom 6:23) and would eventually die because the soul that sins will die (Ezk 18:20). They had lost their chance at eternal life and their only hope would be that they repented but there is no evidence that they ever did. We just don’t know for sure if they ever did.