Athanasian Creed: Athanasius, known as Athanasius of Alexandria, was the 20th bishop of Alexandria. His intermittent episcopacy spanned 45 years, of which over 17 encompassed five exiles. He is traditionally thought to be the author of the this Creed named after him. It was created to guard Nicene Christianity from the heresy of Arianism. It is widely accepted as orthodox and some abbreviated versions of it are still in use today. And yes, the intro and outro are actually part of the original text. 

Whoever desires to be saved should above all hold to the catholic faith.

Anyone who does not keep it whole and unbroken will doubtless perish eternally.

Now this is the catholic faith:

   

That we worship one God in trinity and the trinity in unity,   
neither blending their persons   
nor dividing…