This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
... 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 lethal dichotomy that tears man apart: it forces him to choose between making himself able to live and making himself worthy of living. Yet self-esteem and mental health require that he achieve...
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