"Be "unattached"; let things work; let brain centers work; work incessantly, but let not a ripple conquer the mind. Work as if you were a stranger in this land, a sojourner; work incessantly, but do not bind yourselves; bondage is terrible. This world is not our habitation, it is only one of the many stages through which we are passing. Remember that great saying of the Sânkhya, "The whole of nature is for the soul, not the soul for nature."...If we remember this always, we shall never be attached to nature; we shall know that nature is a book in which we are to read, and that when we have gained the required knowledge, the book is of no more value to us. Instead of that, however, we are identifying ourselves with nature...we are regarding nature as ourselves and are becoming attached to it; and as soon as this attachment comes, there is the deep impression on the soul, which binds us down and makes us work not from freedom but like slaves."

- Swami Vivekananda, "The Secret of Work" (Advanced karma yoga class, Dec 20, 1895, New York Vedanta Society), Karma Yoga, Complete Works: Vol 1