This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...bly to pursue. He does not regard “because I want it” or “because I feel like it” as a sufficient cause and validation of his actions. He chooses and/or identifies his desires by a proce 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...
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