This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...nly by the men who choose to think and to produce the goods which they, the looters, are seizing. Such looters are parasites incapable of survival, who exist by destroying those who are capable, 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...
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