The Bible tells us that only God searches our heart and mind.¹  Satan cannot read our minds, for if he could, he would never have tempted Judas Iscariot to betray Christ Jesus.² 

Satan knew that many Jewish religious leaders wanted to kill Christ Jesus, for they had openly plotted against Him to do so.³  Satan, tempted Judas Iscariot to betray the Lord; believing that it would bring about the death of our Lord and Savior.  Satan was correct in his belief, however he never knew that he was furthering God's plan to bring about salvation for mankind.  For if Satan had known this, surely he would not have helped the Pharisees in carrying out their plan; and God's plan of salvation.  I'm sure he (Satan) shuddered when he realized what he had done (Satan was ultimately defeated by Christ Jesus on the cross of Calvary when God judged the sin of the world.)⁴  Jesus had openly declared His purpose in coming to earth; to destroy the works of the Devil and to provide salvation for mankind -  if Satan could read minds, and was all knowing as God is, then he would never have acted as he did.