This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...ss of reason, and he does not act to achieve a desire until and unless he is able rationally to validate it in the full context of his knowledge and of his other values and goals. He does not ac t until he is able to say: “I want it because it is right.”

The Law of Identity (A is A) is a rational man’s paramount consideration in the process of determining his interes
ts. He knows that the contradictory is the impossible, that a contradiction cannot be achieved in reality and that the attempt to achieve it can lead only to disaster and destruction. Therefore,...
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