This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
...the productive work of his mind; his enjoyment of life is fed by his unceasing concern to grow in knowledge and ability — to think, to achieve, to move forward, to meet new challenges and over come them — to earn the pride of a constantly expanding efficacy.

A different kind of soul is revealed by the man who, predominantly, takes pleasure in working only at the routin
e and familiar, who is inclined to enjoy working in a semi-daze, who sees happiness in freedom from challenge or struggle or effort: the soul of a man profoundly deficient in self-esteem, to who...
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