Here's an excerpt from Volume II of B.B. Warfield's commentaries, entitled 'Biblical Doctrines', and the chapter is 'Christ our Sacrifice'.
"Christianity did not come into the world to proclaim a new morality and, sweeping away all the supernatural props by which men were wont to support their trembling, guilt-stricken souls, to throw them back on their own strong right arms to conquer a standing before God for themselves. It came to proclaim the real sacrifice for sin which God had provided in order to supersede all the poor fumbling efforts which men had made and were making to provide a sacrifice for sin for themselves; and, planting men's feet on this, to bid them go forward. It was in this sign that Christianity conquered, and it is in this sign alone that it continues to conquer. We may think what we will of such a religion. What cannot be denied is that Christianity is such a religion."- Benjamin B. Warfield