“The person who lives life fully, glowing with life's energy, is the person who lives a successful life.”
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Daisaku Ikeda 25
Japanese writer 1928Related quotes
Because if you have not experienced life, how can you share that experience with people?
Quoted in Hong Kong's Career Times newspaper (March 29th 2002) http://cthr.ctgoodjobs.hk/article/show_article.aspx/1174-10369-a-five-year-challenge-for-mainland-management-systems
Miscellaneous Quotes in the Press (2002-Present)
“The less life in a person, the more he will try to live off your life.”
Solved:The Mystery of Life

Source: Inner Management: In the Presence of the Master

Not by Twain, but from Edward Abbey's A Voice Crying In The Wilderness (1989).
Misattributed

“Each person must live their life as a model for others.”

“I can't imagine a person becoming a success who doesn't give this game of life everything hes got.”
Source: Free the Airwaves! (2002)