What an interesting question! No The devil cannot read our minds but....He can extrapolate from our speaking what line our thoughts are taking...As someone above said, Satan can plant thought in our head...That's why Jesus said to "Take no thought saying..." When you speak a thought, yours or someone elses you take that thought, you give it life. A thought unspoken though will die stillborn. Speak only what the word says about everything. Nothing more
Just want to add to this!!
We have all heard we have an inner ear and outer ear. This is very true in the Spiritual side of things too.
Have you ever told a story so many times that over the years you really believe it to be true?
Start reading your favorite verse. Half way through begin to spell your name out loud.
What happened?
Your brain began to totally focus on what you were saying.
Please see this.....
Its the same within our Spirit.
Our own words Influence our believing more then anything.
That's why satan is after your words.
One thought at a time. he has been manipulating and deceiving people since the beginning as is thee master of deception.
he is constantly at work trying to get you in a place where he has a legal right to steal, kill and destroy.
It's not power of the devil for he has been stripped of it. It's his trickery or the wiles that we are concerned with.
If you think, ahh man he can't trick me, well you are already half way beat.
Blessings
W4F