"Conscience is the voice of God in our hearts and minds, not our own voice."
I strongly disagree with the premise that conscience is "not our own voice". This is, to my mind, a serious error, and that it is one of the most pernicious traditions of our Church.  Granted it is widely held and professed but it is a denial of God's generous gift of free will in human creation. Yes, it is clearly an essential dimension of "the image and likeness" along with intelligence. 
That intelligence and conscience is the capacity to recognize and acknowledge what is right and wrong and our responsibility to do what is right. It is also the ultimate capacity to conclude in an act of faith in and to God and to find our way with and through Christ back to the Creator.