God Provides The Teaching We Need in His Scriptures:  2 Timothy 3:16, 17 - "Every scripture inspired of God is also profitable for teaching, for reproof, for correction, for instruction which is in righteousness: that the man of God may be complete, furnished completely unto every good work." By the Scriptures the man of God is outfitted unto every good work.  

God Provides Everything We Need:  2 Peter 1 :3, 4 - "Seeing that his divine power hath granted unto us all things that pertain unto life and godliness through the knowledge of him that called us.

God Sent His Message One Time for All Mankind:  Jude 1:3 Beloved, while I was making every effort to write you about our common salvation, I felt the necessity to write to you appealing that you contend earnestly for the faith which was once for all handed down to the saints.

There is No Need For Additional Messages or Teachings:  Galatians 1:8 But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!

So, Our Creed is God's Word and Only God's Word.