Hearing

The Sefer Yetzirah associates the month of Av with the sense of listening.  The Bnei Yissachor (maameray Tamuz and Av 1:3) says the decree of 9 Av was sealed due to listening to the meraglim which is a lack in proper listening.  The Sefer Yetzirah also connects the month with the letter ט.  The letter ט is טוב גניז בגויה (as the Zohar says,) which is related to the ear which has an external covering and the internal part.  The sense of hearing contains the capability to bring out a internal goodness or destruction when it is misused.  Why is the sense of hearing connected to golus?  

The word for hearing שמע is the same word as the word gather as in וישמע שאול את העם (see Likutay Torah Vaeschanan.)  When one listens to Hashem, a person's capabilities are aligned.  When one does not listen, then a person's internal order is disturbed.  The golus is a collective of all of the individual internal states of golus (see Shuvi V'necheza siman 25.)  

The original sin of mankind stemmed from Chava listening to the snake and then Adam listening to her.  G-d asks Adam איכה the same word as the איכה we read on tisha b'Av.