In the forefront, evil presents itself as Light, if you will. Then, very subtly, little by little, draws us in to compromise in such a way, that before we know it, we've surrendered our perspective (thoughts; mind; beliefs) to the deception which in truth is, the Deceiver.
When truth, or one might say, the revealing of the true face of deception, is presented to us, we then have a choice to accept the Truth and walk in freedom or, to continue blindly within the grip of the Deceiver.
Think of it this way, an addict cannot be set free from the addiction without first coming into the understanding that the addiction does indeed exist and has a grip upon his/her thoughts and actions/decisions. The person must come to acknowledge that they are enslaved by the very thing they perceived to be as merely a controlled choice or simply a pleasure they continued to partake in.
Just like the children of Israel had to let go of some of their familiar routines and conveniences in order to be truly free and able to dwell in their true identity and promised land, likewise, we are in a time like no other that we too must choose whether we will remain in captivity to the world's way of thinking or step into the freedom of the Kingdom with the mind of Christ.
His light within us has already overcome the darkness but we must stop surrendering to and agreeing with the darkness in order to walk in the genuine fullness of His light/kingdom.
As Believers in Christ, victory cannot be taken from us, it can only be surrendered by us.