Shaykh al-Islām Taqī al-Dīn Ahmad ibn Taymiyyah—may Allah Most High have mercy on him—said:

All praise is due to Allah. We seek His help and forgiveness, and we seek refuge in Allah from the evil within ourselves and from our evil deeds. Whoever Allah guides, none can lead astray, and whoever He leads astray, none can guide. I bear witness that there is no deity worthy of worship except Allah alone, without partner, and I bear witness that Muhammad is His servant and Messenger. May Allah bless him, his family and his Companions, and grant them abundant peace.

Section: The Sickness of Hearts and Their Healing

Allah Most High said concerning the hypocrites:

“In their hearts is a disease, so Allah has increased their disease.”

And He, Most High, said:

“So that He may make what Satan casts forth a trial for those in whose hearts is disease and those whose hearts are hardened.”