Quote from the conference in Ottawa: from Shaykh Mokhtaar Maghraoui
Shaytaan wants us to end up in jahannum. He wants to own our hearts.
The hearts are the most prized gifts from . The heart that is the most happy is the heart filled with Allah. Thus He (Shaytaan) wants to own it.
Hadith: Inna shayttaana jahaimun al qalb e adam
The shaytaan is ever watchful over the heart of the child of Adam
eg Shaytaan can be likened to a cheetah watching for a chink to enter it (the heart of the child of Adam) and attack.
If the person is in Dhikr of Allah, Shaytaan runs away, if the person is in ghafala, shaytaan attacks!