Hebrews 10:22 Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.

The Word of God ties the conscience to the condition of our heart. If your heart is not pure, the conscience will not exhort you to good deeds.

Luke 11:34 Your eye is the lamp of your body. When your eyes are good, your whole body also is full of light. But when they are bad, your body also is full of darkness.

Do you think we see what we are doing as being an evil thing? Our conscience tells us what we are doing was good and right. A conscience does wrong if the heart is wrong. You must always guard your heart and protect it.

Matthew 5:8 Blessed are the pure in heart: for they shall see God.

The conscience is a function of the mind. It is a reasoning power which weighs character against desire. All healthy humans have this power of reasoning. It is developed, learned through training and practical exercise. There are consequences for actions, we must weigh penalty against desire. Christians do not own the corner on a good conscience. Non-believers can be just as law abiding as Christians.

Romans 2:14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:

The conscience we are seeking to discover here goes above and beyond the natural, beyond developmental training, beyond historical insight. The conscience we seek to develop is one which is a reflection of the changed heart, the new creature, the new man in Christ. It will serve you to stay out of trouble areas where the law allows access.

Proverbs 4:23 Keep thy heart with all diligence; for out of it are the issues of life

Keep here is the Hebrew word natsar which means to guard with fidelity.