impasse, n.All

Impasse (n.) of ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠Zen training is a mosquito biting an iron bull, or a man who has swallowed a red-hot iron ball he can neither spit out nor gulp down.