Why does the Bible contain...

• Acts 23:1
  Then Paul, looking earnestly at the council, said, "Men and brethren, I have lived in all good conscience before God until this day."
   
• Acts 24:16
  This being so, I myself always strive to have a conscience without offense toward God and men.
   
• Acts 26:9-11
  Indeed, I myself thought I must do many things contrary to the name of Jesus of Nazareth. This I also did in Jerusalem, and many of the saints I shut up in prison, having received authority from the chief priests; and when they were put to death, I cast my vote against them. And I punished them often in every synagogue and compelled them to blaspheme; and being exceedingly enraged against them, I persecuted them even to foreign cities.

If the Conscience is a Safe Guide?

What about Faith Only (beginning in James 2)?