This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...estroys it is the evil.
read full book
Since everything man needs has to be discovered by his own mind and produced by his own effort, the two essentials of the method of survival proper to a rat
ional being are: thinking and productive work.
If some men do not choose to think, but survive by imitating and repeating, like trained animals, the routine of sounds and motions t
hey learned from others, never making an effort to understand their own work, it still remains true that their survival is made possible only by those who did choose to think and to discover the...