This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
..., involves not only the creed of self-sacrifice but all the foregoing tenets of traditional morality.

An irrational morality, a morality set in opposition to man’s nature, to the
facts of reality and to the requirements of man’s survival, necessarily forces men to accept the belief that there is an inevitable clash between the moral and the practical — that they mus t choose either to be virtuous or to be happy, to be idealistic or to be successful, but they cannot be both. This view establishes a disastrous conflict on the deepest level of man’s being, a...
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