For many believers, the danger that spiritual forces
pose to our everyday walk is almost ignored. The
clear teaching of Scripture in Ephesians 4 that
“ground” can be given for demonic influence in our
lives is not heeded. One way to consider demos is to
say we need to avoid their entrance into any part of
our lives, and never allow them to start exerting any
hold on us. First consider what Paul says in
Ephesians 4:26-27 "Be angry, and do not sin": do not
let the sun go down on your wrath, 27 nor give place
to the devil. (NKJV)

• Ground. The demons need a ground of entrance to
get into our lives. "Ground" has been defined as
"anything that gives advantage to Satan." Examples of
"ground" that give opportunity for the devil and
demons to enter are: uncontrolled anger,
disobedience, religious fanaticism, false cults,
lust, sensuality, etc. According to Mrs. Penn Lewis,
in her book War on the Saints, “This ground needs to
be discovered, confessed to God as sin, and then
cancelled in the name of Jesus Christ.”
• Hold. Once a demon gains entrance, it must
maintain a "hold" within the person. It is not
always the same in every person. In King Saul's
case, his open disobedience to the Word opened the
way for a demon to enter his life. The demon's hold
on him was depression and serious anxieties connected
with murderous thoughts.