But by the captivity of our understanding, is not meant a submission of the intellectual faculty to the opinion of any other man; but of the will to obedience, where obedience is due. For sense, memory, understanding, reason, and opinion are not in our power to change; but always and necessarily such as the things we see, hear, and consider suggest unto us; and therefore are not effects of our will, but our will of them. We then captivate our understanding and reason when we forbear contradiction; when we so speak, as by lawful authority we are commanded, and when we live accordingly, which, in sum, is trust and faith reposed in him that speaketh, though the mind be incapable of any notion at all from the words spoken.