Chandogya Upanishad is one of the oldest Upanishads written on the Vedic Brahmana period about ninth to eighth century BC. Chandogya Upanishad is associated with Sama Veda. It is the part of Chandogya Brahaman that contains eight chapters. The 21st Khanda of Chapter Seven of Chandogya Upanishad states that single mindedness depends upon concentration. Narada had approached Sanatkumara to receive knowledge about the real Self or the Supreme Brahman. Sanatkumara considering him to be a worthy pupil instructed him concentration. He told him that when one performs one`s duties i.e. he practises concentration, then only he acquires single mindedness. One who does not perform his duties does not possess single mindedness. Only one who performs his duties has single mindedness. Thus, one must desire to understand the performance of duties. Upon hearing this Narada also expressed his desire to understand the performance of duties.
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