This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... those who are pursuing a course of action proper to man.

The men who attempt to survive, not by means of reason, but by means of force, are attempting to survive by the method of
animals. But just as animals would not be able to survive by attempting the method of plants, by rejecting locomotion and waiting for the soil to feed them — so men cannot survive by attemptin g the method of animals, by rejecting reason and counting on productive men to serve as their prey. Such looters may achieve their goals for the range of a moment, at the price of destruction: t...
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