It is a kind of occult power that some have from birth and develop it with practice.
Others do it through a kind of occult siddhis, a dark and dangerous method wherein they capture some small vital entities, known as karnapisachini, who tells the magician or the baba ji about what the other person is thinking as it has access to subtle world where thoughts can be seen. But the practitioners of this method get captured by the being of the vital world who claims them after death and thus blocking further spiritual progress for long time.
Sometimes these powers awaken as a result of growth of spiritual consciousness especially if it is needed for God’s work. Then they are safe but most yogis just discard these attractions lest they get lured and lose their way.
Affectionately,
Alok Da
