No, Satan does not know anything about us. The only thing he knows is the thoughts he throws into our minds. The gospel tells us that he is a liar and our enemy. He came to steal, kill and destroy. When the gospel speaks about our mind, it does refer to our heart. Satan does not read our minds, but he can influence our thoughts and thinking. Satan sees our behaviors, actions, choices, and decisions we make. He studies our actions to know our tendencies and weaknesses, and then he starts to create his plan of temptation to attack us. For example, he throws questions about God’s power and authority, His love for humanity, etc. Also, he throws thoughts of envy, pride, hurt, division and hatred.
So the truth is that satan does not read our minds, but he responds to our demonstrated patterns of behavior. When he sees that you are not satisfied with what you have and never thank God for his provisions and you are looking to others possessions and have the tendency to envy them, he quickly throws the thoughts of blaming and cursing God for his poor provisions, envying your friend of having better or more than what you have. He keeps sending thoughts of hatred and dissatisfaction until he influences you to take action. This action is sin. Proverbs 4: 23 says “Above all else, guard your heart, for everything you do flows from it.” From the heart, means from the mind comes out our actions.
We must know that our mind is our control center, and everything we do comes from the thoughts we think about. The choice we make is always after an idea we have. The first sin Eve did was after satan influenced her thoughts. She made a decision based on the influence that happened to her thoughts. In the epistle of St. James chapter one, we find a clear explanation of how sin begins. “But each person is tempted when they are dragged away by their own evil desire and enticed. Then, after desire has conceived, it gives birth to sin, and sin, when it is full-grown, gives birth to death” (James 1:14-15). This verse explains how sin begins. First, with evil desire, and this comes from our thoughts. Therefore, Satan will attempt to influence our thoughts because if he can do that successfully, this will lead to our actions and sins.
The last thing I want you to know is that Satan never knows our thoughts from the Holy Spirit. So We have to be sober and alert, filter our thoughts, accept those from the Holy Spirit, and reject those from evil. Now the question is, how to know if this thought is from the Holy Spirit or Satan? Simply, those thoughts of love, unity, encouragement, peace, kindness, mercy, satisfaction, and thanksgiving are from God. Those of hatred, envy, strife, division, fear, sadness, and cruelty are from Satan.