I wonder if this works for people in the age of competition. I think what this rule could also mean is that one should strive for what one wants to achieve, but should compete only with oneself. And not forget, in the process, that the ultimate aim is being one with God.
“While everyone in this world strives to get somewhere and become someone, only to leave it all behind after death, you aim for the supreme stage of nothingness. Live this life as light and empty as the number zero. We are no different from a pot. It is not the decorations outside but the emptiness inside that holds us straight. Just like that, it is not what we aspire to achieve but the consciousness of nothingness that keeps us going.”