Rumi

There is one thing in this world you must never forget to do. Human beings come into this world to do particular work. That work is their purpose, and each is specific to the person. If you forget everything else and not this, there’s nothing to worry about. If you remember everything else and forget your true work, then you will have done nothing with your life.

– Rumi (from The Soul of Rumi, translated by Coleman Barks)