One great cause of failure is lack of concentration.

One great cause of failure is lack of concentration.

Bruce Lee

Quote authenticity

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2017 November 02	Origin: Tweet Link: https://twitter.com/brucelee/status/902197350709567488 "One great cause of failure is lack of concentration." #BruceLee #StayFocused https://t.co/zfsEYYZukU — Bruce Lee (@brucelee) August 28, 2017	Image evidence