Tao Te Ching

“‘If I haven’t anything in my mind what shall I do?’ Joshu replied: ‘Throw it out.’ ‘But if I haven’t anything, how can I throw it out?’ continued the questioner. ‘Well,’ said Joshu, ‘then carry it out.’”

— Joshu, Zhàozhōu Cōngshěn 趙州從諗 778 – 897 CE