JC Ryle a pastor in the 19th century wrote:

“The saddest symptom about many so-called Christians is the utter absence of anything like conflict and fight in their Christianity.”

In Ephesians, Paul has just shown how the Spirit-filled home is a glorious picture of the loving relationship between Christ and the church (5:18-33). But he continues by telling us that the Christian life is nothing less than warfare against the devil. It is vital for your survival as a believer to know that you are in God’s Army and daily you are engaged in a battle with an unseen spiritual enemy that seeks to destroy you. We need to be strong so we can stand.