These prayers instill a sincere gratitude for the tireless vigilance and care of one's Guardian Angel, awakening an awareness of their ever-present closeness.

Rejoice, O Angel of the Lord, my tireless Guardian!

What is an Akathist?  An akathist (Greek, akathistos) is a hymn dedicated to a saint, holy event, or one of the persons of the Holy Trinity. The word akathist itself means "not sitting." (Source:  https://orthodoxwiki.org/Akathist)