If one does not perform duty to one whom the duty is due, one becomes a thief of the duty.

Avesta, Videvidad 4.1 

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Your work is to discover your work and then with all your heart to give yourself to it. That's the mark of a true professional.

Gautama Buddha *

Doing is very good, but that comes from thinking...fill the brain, therefore, with high thoughts, highest, ideals; place them day and night before you; and out of that will come great work.

Swami Vivekananda

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Hard work is painful when life is devoid of purpose. But when you live for something greater than yourself and the gratification of your own ego, then hard work becomes a labour of love.

Steve Pavlina