Demons, anything, can utilize one's thoughts, even one's heart, against them.  Certain thoughts will trigger certain reactions in the heart.  If the heart gets sick from the acceptance of a lie, but the target doesn't know it's a lie, or falsehood, then an evil thought injection can be utilized to make oneself think their heart is sick because of a different reason.  The clearance of lies and acceptance of the Truth helps to clear this possibility from being used against oneself.  One must remember how deceitful the heart can be, and must stick to the Truth that is also in other parts of their being.

Each part of one's being can have multiple dimensions.  [That's a lot to learn about.]

Perhaps Free Will is something that should be treasured.  It is a part of a person, and a gift from Father, at that.

Love doesn't force its way on others.