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The great task demanded of man is reproduction. He is urged by passion to perform this task. Passion, working through the imagination, produces love. Passion is the impelling factor, imagination the disturbing factor; and the disturbance of passion by imagination produces love.

Jack London (2013). “Delphi Complete Works of Jack London (Illustrated)”, p.442, Delphi Classics
The great task demanded of man is reproduction. He is urged by passion to perform this task. Passion, working through the imagination, produces love. Passion is the impelling factor, imagination the disturbing factor;