Energy is the essence of life.

精力是生活的本质。

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And all the essence of life is actually material.

而一切生命的本质其实也是物质的。

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People live for love, this is the essence of life.

人们活着是为了爱，这是生活的要旨。——高尔基。

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Junior Seau, certain Hall of Fame National Football League Linebacker, was the essence of life force itself.

FORBES: When Playing Football Leads to Death

For many people, La Digue sums up the essence of island life in the Seychelles.

BBC: The perfect trip: The Seychelles

The essence of the life of Walt Disney, dreamer, innovator, entrepreneur and protean exporter of American culture--and dead for 40 years this month--has eluded biographers.

FORBES: Magazine Article