You must keep the mind fixed on one object, like an unbroken stream of oil.
- Swami Vivekananda.
Reserve unto yourself the power of detaching yourself from everything, however beloved, however much the soul might yearn for it, however great the pangs of misery you feel if you are going to leave it. Still, reserve the power of leaving it whenever you want.
(Complete Works, Vol. 2, p.2-3)
This is the one cause of misery: we are attached. We are being caught. Therefore says the Gita: "Work constantly. Work, but be not attached; be not caught.