Demons are waiting for an entry way into the mind.  All Christians have natural tendencies for particular types of sin.   Sensitivity to the Holy Spirit keeps the demonic attacks from going to deep level.  Be sure to forgive anyone that has hurt you in any way, forgive yourself for mistakes and sins you have not confessed, and forgive God for not moving in a particular situation as you thought God should move. 

For example, if there is an interruption of peace in my soul or the Holy Spirit gives a  tightness in my spirit,  I immediately  begin to practice spiritual warfare.  During a demonic attack, spiritual warfare might need to be practiced frequently through the day and night.   I might have a spontaneous thoughts that gives me  words like "inferiority, or "envy" or "gossip."  If my current thoughts are in the consistent with  the names of  demons, I begin to cast them to the pit of  hell.

Not all thoughts are demonic in origin.  Some thoughts are originated from the soul.    There is a conviction from the Holy Spirit concerning sin,  confess the  (dwelled on) thoughts and replace them with scriptures.   Spiritual peace is re-established in the name of Jesus.

The Holy Spirit has always showed me how to  maintain my deliverance for the past twenty years.  My personal experience has been that demons can attack by gaining strength through "footholds" of weaknesses in my life.    They attack through my mind using my emotions, past hurts and any weakness against me.   I can sense that I am being attacked directly in the following ways:

If I am not watchful and feel sorry for myself, I can entertain these thoughts until  the Holy Spirit puts a check in my spirit; then I know these thoughts are not mine and certainly not from God.  Spiritual Warfare begins:

Put on the helmet of salvation.  I acknowledge that I have been saved by the blood of Jesus and no one shall snatch me out of His hand.

Put on the Sword of the Spirit.  I find that speaking the Word of God clears the demons out of my way.  For every demonic lie, I counter with declarations from the Word of God. I speak these declarations aloud or think them if I am in a place I cannot speak.

 These spoken declarations (only a few are listed above) begin to activate additional spiritual armor for battle with demons.  The belt of truth is tight around my waist.  The belt helps to hold up the body, soul and spirit while  speaking my declarations.  The breastplate of righteousness of Jesus Christ maintains spiritual position of authority over demons. 

The shield of faith begins to throw off all the lies and accusations.  I am stronger and more confident as I use all the spiritual armors given to me.

The demons flee. Praise God.