Salvation is the doorway into the Kingdom of God. We are reborn into His Kingdom. He gives us spiritual eyes to see according to the Spirit. He tells us what He sees. And we by faith agree with Him and begin to see as He does.
Here's how this plays out:
If we don't believe we are saved, the only eyes we have left to see out of are fleshly and carnal. This is being conformed to the world. The world determines what believe, what is true, and who we are in this state of mind.
If we believe we are not a new creation, our eyes are on ourselves to try to be something we are not. This is a very religious mindset, it's the older brother who worked in the fields without joy. He waited for his Father to throw the party for him. Even though he had access to what the Father did through his inheritance.
If we don't believe other people are a new creation in Christ, we will tear them down instead of building them up. We will see them by the flesh instead of by the Spirit. Satan was the first accuser. God was the first Redeemer. Which Spirit are we of? This is something I am myself working out through relationship with God. Because I do value truth so much, I have a tendency to come against lies with a hammer of truth, but Paul tells us that it is love that never fails.
I believe there is a higher truth than simply principles we argue about. I believe the higher truth is who Christ is in us and who we are in Him. Speaking to one another and in truth is correcting people back to who they truly are. Getting their minds off the carnal only option and back to being renewed by His truth about them.
This is something I'm growing in myself. Not reacting to lies, but respond to His truth.