[padfoot_lover]

BTW - the thrice holy prayer that our Lord requested at the end of the chaplet is the very ancient Trisagion , that has been prayed by the Eastern Churches for 2,000+ years. In giving it to St. Faustina, He extended it to the West.

That is awesome! I am thrilled to be learning more about the wonderful Eastern Rite of our Church lately, thanks!

[NYer]

The trisagion device is familiar from the Bible

“Holy, holy, holy, is the Lord of Hosts,” (Isaiah 6:3)

and the mass “Holy, holy, holy, Lord God of Hosts.” 

In the Maronite liturgy, it precedes the readings. The entire congregation stands. The priest faces the Tabernacle and chants these words in Aramaic ... 3 times.

Qadeeshat aloho; Qadeeshat hyeltono; Qadeeshat lomoyouto.
Holy are you, O God; Holy are you, O Strong One; Holy are you, O Immortal one.

Each time he makes a profound bow towards our Lord, present in the Tabernacle. The congregation responds with:

Itraham alein - Have mercy on us.

As far as I know, all of the Eastern Churches include the Trisagion in their liturgies. It would be a veritable blessing ot see the Latin Church follow this practice.