The Harm Caused by Sins and Misdeeds

It should be known that sins harm the doer; its harm to the heart is like the effect of poison on the body, according to the degree of the damage done. In fact, all the evil and harm that one faces, in this world and the Hereafter, are caused by one's sins and misdeeds.

What ousted our parents (Adam and Eve A.S) from Paradise, the place of pleasure, blessings and delight, to the dwelling of pain, torment and misfortune?

What was the cause for Satan to be kicked out of heaven, and have his external and internal forms distorted? Allah Subhaanuhuwata'aala disfigured him to a most horrible shape, and made him possess the most evil intentions. He Subhaanuhuwata'aala withdrew His Mercy from him and made him live under His Curse. He Subhaanuhuwata'aala replaced Satan's dwelling from Paradise to Hell, because Satan disobeyed Allah Subhaanuhuwata'aala and turned to polytheism. He was despised in the Sight of Allah Subhaanuhuwata'aala, because he followed his own desires and rejected the Command of Allah Subhaanuhuwata'aala, and so earned His Anger.

IMAM IBNUL QAYYIM AL-JAWZIYYAH