Since then your sere Majesty and your Lordships seek a simple answer, I will give it in this manner, neither horned nor toothed. Unless I am convinced by the testimony of the Scriptures or by clear reason (for I do not trust either in the pope or in councils alone, since it is well known that they have often erred and contradicted themselves), I am bound by the Scriptures I have quoted and my conscience is captive to the Word of God. I cannot and I will not recant anything, since it is neither safe nor right to go against conscience. May God help me. 
Martin Luther, Luther's Works, 33: Career of the Reformer III
belief, christian, conscience, freedom-of-religion, freedom-of-thought, organized-religion, reformation, religion, steadfastness, truth