This is a feeling I have often felt. Satan would respond by reassuring me one way or another, especially in deadlocks where I might have made the wrong decision.
His response is also a quick change of mood or thought, when unpredictable considering your character and way of doing things.
But the greatest reassurance is the power to build your own strength, while Satan holds your hand assuring you of his protection.
This is a privilege of Satan's people, which does not exist for others.
The more you advance, the more you become aware of it, and you recognise that this is an enormous privilege.