What does the donkey riding song mean?

About the song of riding a donkey, the relevant contents are as follows:

This is the most commonly used hymn in Palm Sunday service. The author of this poem is millman, a famous pastor of the Anglican Church (179 1- 1868). He got excellent grades at Oxford University and began to write plays. Later, he wrote three religious historical plays: The Fall of Jerusalem and The Martyrs of Antioch and Bethsaida.

After graduating from college, he stayed as a professor of poetics. This song "Riding a Donkey" was his work in this period, when he was 30 years old. Later, he accepted the priesthood, serving as the pastor of St. Mary's Church, Westminster Abbey and St. Paul's Cathedral in London.

Riding on a Donkey is one of the twelve hymns written by millman at the request of Bishop Heber. This is a hymn often sung for the Palm Tree Festival every year, which is highly praised by Bishop Heber? Bishop Heber died before he finished compiling this hymn, and his wife died later? Compiled in 1827).

The last verse of this poem is the climax of this poem; In particular, the second sentence, "Humble appearance is for immortality", is the center of this poem and tells the purpose of the Lord Jesus riding a donkey.

Millman is not only a famous English missionary, but also a famous historian. Author of Jewish History, Latin Christianity and Biography of Gibbon, he is the editor-in-chief of the world famous book The Rise and Fall of the Roman Empire written by Gibbon. At the same time, millman is a famous poet, and his poems have won the Oxford Prize for Poetry.