Recommended Book: First Epistle of Clement to the Corinthians - Kindle Edition (get Kindle app for phone) (paid link)
O my God,
I firmly believe that you are one God in three divine Persons,
Father, Son, and Holy Spirit;
I believe that your divine Son became man and died for our sins,
and that he will come to judge the living and the dead.
I believe these and all the truths which the Holy Catholic Church
teaches, because you revealed them, who can neither deceive
nor be deceived.