Here is perhaps the most important things to know about fear: it is not just a physiological response to circumstances.

Fear is also a spiritual phenomenon, inflicted upon you by the devil.
God built a “flight-or-fight” mechanism into you for your protection. The rush of adrenaline known as a “panic attack” will also, in the face of real danger, give you an instant boost of strength.

But Satan and his demons, as they always do, have taken God’s gift and have corrupted it by using it against you. They do it by planting thoughts into your mind, thoughts of impending disaster and doom. They are behind all of those “what if” questions that tie you in knots of fear. That fear is caused by the devil!

Paul wrote:

Our struggle is not against flesh and blood, but— against the spiritual forces of evil in the heavenly realms.” (Ephesians 6:12)

The “voice” you “hear” in your thoughts sounds like your “voice”. But often, it isn’t. It may be the voice of a demon, impersonating you by “whispering” thoughts into your mind. In this way, demons are able to trick you into believing their lies.