credo

noun2

1. •
   A statement of a belief or a summary statement of a whole belief system; also (metonymically) the belief or belief system itself.

   • “You’re either with me or you’re against me” became Dany’s credo, and those against her were an ever-changing multitude to be determined solely by her whims. — 2019
2. •
   The liturgical creed (usually the Nicene Creed), or a musical arrangement of it for use in church services.

   • Credo III is so beautiful!