The Doxastikon for Pentecost explains the Trisagion prayer. Why emphasize the Holy Trinity?

Audio: http://www.orthodox.net/sermons/pen-sun-00_2023+doxastikon-for-pentecost+dogma.mp3
Video: https://youtu.be/1LmUhnI6XFU

An excerpt from a homily on Pentecost, 2023, explaining the Doxastikon for Pentecost, and the reason for all the fuss about DOGMA.

0:00 - 4:45 The Doxastikon for Pentecost explains the Trisagion prayer. Why emphasize the Holy Trinity?
2:38 – 4:45 Dogma IS life.