A professor from some university had a few questions on Zen practices so he visited a Japanese Zen Master 'Nan-in'. Nan-in poured tea in the visitor's cup and kept pouring. The cup was full yet Nan-in would not stop. He kept pouring despite knowing that the tea was overflowing from the cup.
The professor could not resist this scene for long. He asked with surprise, "why are you pouring tea in a cup which is already full. No more will get into it now."
लाभस्तेषां जयस्तेषां कुतस्तेषां पराजयः I येषामिन्दीवरश्यामो हृदयस्थो जनार्दनः II