This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...le of the Objectivist ethics is that just as life is an end in itself, so every living human being is an end in himself, not the means to the ends or the welfare of others — and, therefore, th at man must live for his own sake, neither sacrificing himself to others nor sacrificing others to himself. To live for his own sake means that the achievement of his own happiness is man ’s h ighest moral purpose.

In psychological terms, the issue of man’s survival does not confront his consciousness as an issue of “life or death,” but as an issue of “happiness ...
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