"Yet, if it had not been for the law, I would not have known sin. I would not have known what it is to covet if the law had not said, 'You shall not covet.'" (Romans 7:7)

Without the law we do not have the criteria whereby we could recognize difference between good and bad and to employ properly our own will in life temptations. That's why one of the main objects of Satan's efforts is contesting the law; whether by stating that it is abolished or by trying to present distortedly its own nature (the same it was with Pharisees).

To understand properly the nature of the law means to be wise. When we choose sin deliberately, then the wisdom hinders us because the ability discerning good and evil induces us to be reprimanded for our own sins.

The truth warns us through the conscience asks for a reform of our motives. That's why we try to understand the truth in a way which is not going to make us morally responsible, in a way our conscience will stay calmed. We run away from the wisdom to the superficiality. Different mechanisms of escaping the truth result in different philosophies of life (deceptions).

If we go sincerely against our conscience by making sin then our conscience gets blunt and the common sense can stay saved. But if we are people with sensible conscience and if we do not want to go against it then we have to cheat it up pronouncing all our sins before it. In the first case we loose conscience and in the second our common sense.

When we are separated from God the deception brings a "peace" to our conscience as well as a sin brings a "happiness" to our heart. Consequently, without an unclean conscience, nobody would prone to trust in the deception, as well as nobody without an emptiness in his heart would be prone to fall into sin. As well as a pleasure is a physical need of a sinful man, so the deception is an intellectual need of his unclean conscience.