Based on the favourite upaishad of Swami Vivekananda the KATHO UPANISHAD ( & others too ) is indeed one of the greatest exquisite jewel for the meditative vedantic seekers !
This great chapter of Shrimad Bhagwat Geeta 6 chapter Dhyan yoga at some point it tells us about how to make the peace with the moment and help everybody around us through the meditative life !
When we define the voice of consciousness within : we are actually completely abiding in that voice of the ATMA = the substratum of all our thoughts emotions and objects !