Now we have been given two main faculties of perception: the senses of touch, smell, and taste, which form the lower senses, and the hearing and seeing faculties called Sami and Basir in Sufi terms, which are the higher or principal senses. These two groups both work with the physical body, the latter with the ears and eyes, but in reality they work in the mind; it is the mind which listens and sees. The mind is listening when it is aware of things without people telling us. We notice when a person is displeased. A person may say, "Thank you", and yet the mind perceives that he is not really thankful but is using these words as a formality, or even out of sarcasm. So it is the mind which discriminates; the ears of the mind listen. The more developed the mind is, the more it can listen even without the help of the ears; it listens to another person's thought without the utterance of a sound. The mind can see the form of the thoughts and discriminate between them, and this is what a seer does; however, it is easier for the mind to perceive by hearing than by seeing.