Kowtow to the teacher.

In ancient times, teachers kowtowed three times.

First, heaven and earth ghosts and gods.

Second, I learn from my ancestors.

Third, take the teacher as the father.

Knock three times to worship the emperor nine times, knock three times to worship God and knock four times to worship ghosts.

There is a folk saying of "three ghosts and four gods", that is, kowtowing to bodhisattvas, buddhas, immortals, Taoism, heaven and earth and teachers three times. You should knock four times for the funeral of the dead.

The whole sentence should be "three gods, four ghosts and one person", that is, three gods and four ghosts and one person.