Those who trouble about others' thoughts and interest themselves in others' actions most often lose their time and blunt their inner sight. Those who go farther, their moral is to overlook all they see on their way, as their mind is fixed on the goal. It is not a sin to know anybody's thought, but it is a fault no doubt if one professes to do so. To try to know the thought of another for one's own interest is neither just nor beneficial. At the same time, to sit with closed eyes is not good either.