Jesus heard it, he said to them, "Those who are well have no need of a physician, but those who are sick; I came not to call the righteous, but sinners."

Mark 2:17 

“The illusions of this world soon vanish,
especially if a man arms himself with
the Sign of the Cross.
The devils tremble
at the Sign of the Cross of our Lord,
by which He triumphed over
and disarmed them.”

– St. Anthony Abbot