A servant can be tried with heedlessness (ghafla), desires (shahwa) and anger (ghaḍab). Shayṭān enters into the servant through one of these three doors. Even if he protects himself as much as possible, being heedless is inescapable, or falling into desires or becoming enraged.
Ādam the father of mankind—peace be upon him—was from the most forbearing of the creation, the most intelligent and stable of minds, despite all that the enemy of Allāh [Iblīs] did not give up until he made him fall into what he fell into.
So a person’s forbearance compared with Ādam is like spit of saliva compared to a whole sea [of water]. The enemy of Allāh is not sincere to the believer and waits for him to be careless or heedless in order to strike. So when he causes him to fall into sin, the servant may think that Allāh will not accept him after [committing] it, and that sin has destroyed him. However Allāh’s Grace, Mercy, Clemency and Forgiveness are greater than all of that.
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Remembrance of The Most Merciful | Pg.31-32 | By Ibn Qayyim Al-Jawziyyah | Published & Translated by: Dār as-Sunnah Publishers