"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."

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The art of Navigation demonstrates how, by the shortest good way, by the aptest direction, and in the shortest time, a sufficient ship, between any two places (in passage navigable) assigned, may be conducted; and in all storms and natural disturbances chancing, how to use the best possible means, whereby to recover the place first assigned. Mathematical Preface

— John Dee