It is narrated that once Satan came to the presence
of Hazrat Yahya (a.s.). Prophet Yahya (a.s.) asked him
about his treatment of Adam (a.s)'s progeny. He replied
that men are divided into three groups.
The first group consists of the revered persons who
are always out of his reach. These are the Prophets
(a.s.) and the Infallible.
Then Satan said that the second group consists of the
people over whom he can have his sway. But with penitence
they nullify his maneuvers.
The third group of people is of those in whose hearts
he, Satan, lives. These form the vast majority of people.
O believers! Do such acts that Satan is unable to find
an entry into your hearts! Otherwise, mere utterance
of the words of Ista-aaza will not be of any
use.