The pillars of Imān are the acts of worship of the heart that are required from every Muslim. In the absence of those pillars, the belief of a person is invalid, and it is for this reason that they are called the pillars of faith. The difference between the pillars of Imān and those of Islam is that the pillars of Islam are visible acts performed by the body parts, like Shahādah, prayer, and Zakah, while the pillars of Imān are acts of the heart, like belief in Allah, His Books, and His Messengers.