What does it mean that Christ is our banner?

The term 'banner' as used in spiritual warfare illustrates how Christ represents our strength and guidance. In Isaiah 59:19, it states that when the enemy comes in like a flood, the Spirit of the Lord will raise up a standard against him. This emphasizes that Christ is the standard to which we rally, as seen through the preaching of the gospel. The imagery is akin to soldiers looking to a flag for direction and solidarity. Essentially, Christ reminds us of our identity, the victory achieved at the cross, and encourages us to persevere against sin and the devil's accusations.