Crocodile Law: Suppose a crocodile bites your foot. If you try to free your foot with your hands, the crocodile will bite your foot and hand at the same time. The more you struggle, the more you get bitten. So, if a crocodile bites your foot, your only recourse is to sacrifice one foot.
Song Yuqing belatedly became self-taught on this principle.
Intention: Down to earth, there is no shortcut to success!