As follows:

1. As long as the kung fu is deep, the iron pestle is ground into a needle.

2. Practice makes perfect.

Related introduction:

The man who is good at shooting in ancient legends is a flying guard. From Liezi Tang Wen: Ji Chang learned to shoot from Fei Wei. Fei Wei said,' you can't learn instantly first, but you can shoot with your hand.' Ji Changgui, lying under his wife's machine, took the lead with his eyes. Two years later, although the end of the cone fell, it was not instantaneous. To tell Fei Wei.

Fei Wei said,' If you haven't, you must learn to look at it before you can, look at it as small as big, look at it as small as small, and then tell me.' Ji Chang hung lice on the scorpion and looked at it from the south. Between the ten days, the immersion is also big; Three years later, it was like a wheel. To see the rest, all hills and mountains are also. It is the arc of the swallow's horn, which is shot by the pole of Shuo Peng, which penetrates the heart of lice and hangs on. To tell Fei Wei.

Fei Wei jumped high and bowed, saying, "You've got it! Ji Chang tried his best to defend himself, but only one person was the enemy of the world, which was the murder of Fei Wei. When they met in the wild, they crossed the middle of the road, and when they got off, Feiwei stabbed them with the end of the thorn, without any difference. So the second son cried and threw a bow, worshipping Tu. Please be a father and son, swear by your arm, and don't sue anyone. " According to this, Jichang's murder of Fei Wei is similar to Feng Meng's murder of Yi.