如果没有冬天的寒冷来赋予它甜蜜,夏天的温暖又有什么意义呢?
The true teacher defends his pupils against his own personal influence.
赏析:通过忘记脚、忘记腰、忘记是非纠纷来说明内心的舒适和自在,强调了要放下杂念和纷争,保持内心的平静。