The Trimorphic Protennoia is a Sethian Gnostic text from the New Testament apocrypha. The only surviving copy comes from the Nag Hammadi library (Codex XIII).
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app