Then those who heard it, being convicted by their conscience, went out one by one, beginning with the oldest even to the last.
We know the story of the woman caught in the sin of adultery. The law said that she was to be stoned to death. But Jesus took the law to a higher level. He said to those who were her accusers and executioners, "He who is without sin among you, let him throw a stone at her first."(1) They could not condemn her. Why? They could not cast a stone because they were guilty themselves. Their guilt was revealed to them via their conscience.
The conscience is a good guide and should not be violated. To violate our conscience is to violate our faith. The conscience is the place of awareness with regard to right and wrong. It is that part of our being that reveals to us our standard of morals. Unless the ravages of sin have seared it, it will be a confirmer of right and a revealer of wrong. Here is how we can know the validity of our conscience: it will never violate the Word of God.
(1) John 8:7