Answer:
The most likely source of this quotation is C. Luther's failure to submit to the Pope's demands at the Diet of Worms. This quote is attributed to Martin Luther, a German monk and theologian who was a central figure in the Protestant Reformation. Luther is said to have uttered these words at the Diet of Worms in 1521, where he was called upon to recant his teachings that challenged the authority of the Catholic Church. Instead, Luther stood firm in his beliefs, declaring that he could not go against his conscience and would only change his beliefs if shown to be in error by scripture or reason. This statement is seen as a pivotal moment in the Reformation, as it helped to establish the principle of individual conscience and the right to dissent from established religious authorities.