[T]he parable of a gold stick is often used to discuss the Three Vehicles (teachings for śrāvaka, pratyekabuddha and bodhisattvas). It is said that a gold stick was snapped into three, each of which was given to those with the capacity to understand the Three Vehicles, saying that as each of the three is gold, they do not have to try to find the differences or to discuss which is better among them. This parable sounds reasonable, but in fact the logic is wrong and misunderstood by those who have learned a wrong doctrine.

To further clarify matters, there is an instance when the Buddha took out of the Lotus Sūtra a gold stick used as an expedient teaching, and swung it three times for those with the capacity to know the Three Vehicles. Those who could not recognize this as an expedient teaching believed that the stick was made of genuine gold and thought that they were following the right teachings. If the gold stick were snapped into three in reality, the parable would not make sense. Although the Buddha just swung the gold stick three times instead of snapping it, ignorant people with the capacity to know the Three Vehicles thought that He did break the stick into three. To say it repeatedly, it is a blunder and an error to hold this view.

The Buddha swung the stick three times not to show the Wonderful Dharma of the Lotus Sūtra, but to give the merits of an expedient teaching in the Lotus Sūtra to those who have the capacity to know the Three Vehicles. Therefore, the Three Vehicles, if put back into the expedient teaching of the Lotus Sūtra, are called an expedient teaching within the Lotus Sūtra; they will never become the “perfect teaching.” Remembering this, we should clearly see that there exists the expedient and the True teachings both inside and outside the Lotus Sūtra.

Shoshū Mondō-shō, Questions and Answers Regarding Other Schools, Writings of Nichiren Shōnin, Doctrine 3, Page 181-182