Put On the Full Armor of God

... but understand at this point that wearing spiritual armor is an essential element of putting on Christ and apply the new life of grace in Him; it is not something separate. Putting on God's armor is taking what God has so richly supplied in His Son and appropriating it personally each day. When we put on God's armor, we are doing more than applying a technique or method. We are doing something personal; we are putting on Christ Himself. Since Christ is all-sufficient, everything that we need to be covered is found in Him. All truth is connected to Him (John 14:6). All righteousness has its source in Him (1 Cor. 1:30). He is the central subject of the gospel of peace, for He is our peace (Eph. 2:14) - and so on through the list (Eph. 6:14-17). Clinton Arnold explains that,  therefore, "knowing the truth of who we are in union with Christ, cultivating the virtues of this new identity, and using the resources available through this new relationship are at the heart of what it means to put on the armor of God."

Spiritual Warfare: A Biblical and Balanced Perspective, Brian Borgman & Rob Ventura, Reformation Heritage Books, 2014, pp. 16-17.

Clinton Arnold quote from Exegetical Commentary on the New Testament, Zondervan, 2010, pg. 444.