This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...of non-contradictory joy — a joy without penalty or guilt, a joy that does not clash with any of your values and does not work for your own destruction. ... Happiness is possible only to a rat ional man, the man who desires nothing but rational goals, seeks nothing but rational values and finds his joy in nothing but rational actions.”

The maintenance of life and the p
ursuit of happiness are not two separate issues. To hold one’s own life as one’s ultimate value, and one’s own happiness as one’s highest purpose are two aspects of the same achievement....
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