Hidden Truth

2 Corinthians 4:3 NASB

"And even if our gospel is veiled, it is veiled to those who are perishing,"

In C. S. Lewis' classic "Screwtape Letters", Screwtape tells Wormwood (speaking of demonic attacks)

"It's funny how mortals always picture us as putting things into their minds; in reality our best work is done by keeping things out."

Not only do I see this technique as true and effective, but I also believe that we as believers play a vital role in assuring that this plan be accomplished.
Scripture says the "the god of this world (Satan) has blinded the minds of those  who do not believe" and "our gospel is hidden to those who are lost". The very reason that "our gospel" is to hidden and the reason I say that "believers play a vital role" is because we generally don't share it with "those who are perishing".
Whether out of fear or apathy, the majority of believers keep "our faith" to ourselves and on doing so make the demons job (according to Screwtape) that much easier, while at the same time rejecting God's purpose for our lives!
And that's the "Real Truth"!