Ignatius of Antioch on spiritual warfare

Labor with one another; contend together, run together, suffer together, sleep together, and rise together; as the stewards and assessors and ministers of God. Please him under whom ye war, and from whom ye receive your wages. Let none of you be found a deserter; but let your baptism remain as your arms--your faith as your helmet--your charity as your spear--your patience as your whole armor. Let your works be your charge, so that you may receive a suitable reward. Be long-suffering, therefore, towards each other, in meekness, as God is towards you. Let me have joy of you in all things. 

-- St. Ignatius, Bishop of Antioch, fall 107 A.D. [Letter to Polycarp, Bishop of Smyrna]