The early Church speaks up 
An early creed(0)
The Church, though dispersed through our the whole world, even to the ends of the earth, has received from the apostles and their disciples this faith: [She believes] in one God, the Father Almighty, Maker of heaven, and earth, and the sea, and all things that are in them; and in one Christ Jesus, the Son of God, who became incarnate for our salvation; and in the Holy Spirit…
Healing of the Paralytic, Dura Europos (c.235)
This wall painting, depicting the Healing of the Paralytic, is the earliest known representation of Jesus, dating from about 235 AD. The painting was found in 1921 on the left-hand wall of the baptismal chamber of the house-church at Dura-Europos on the Euphrates River in modern Syria.
The Teaching of the Twelve Apostles
The Didachē is a short catechism, probably written in Syria during the second half of the 1st century. The Didachē is concerned with practical discipline and does not deliberately teach doctrine, but from the writer’s assumptions we learn a great deal about the development of the early Church in his generation.
A Letter From the Suffering Church in Gaul — c. 175 AD
Other writers of history record the victories of war and trophies won from enemies, the skill of generals, and the manly bravery of soldiers, defiled with blood and with innumerable slaughters. But our narrative of the government of God will record the most peaceful wars waged in behalf of the peace of the soul,