Do you have reason? Yes, I do. Then why don't you use it? If your reason does its job, what more do you need?
Hast thou reason? I have. Why then makest thou not use of it? For if thy reason do her part, what more canst thou require?
Keep these two rules always ready. First, do nothing unless reason — coming from the highest part of your mind — suggests it will benefit people. Second, if someone can correct you or show you a better way, be ready to change your mind. Let this change come not from wanting pleasure or praise, but from clear evidence of what is right or what serves the common good.
These two rules, thou must have always in a readiness. First, do nothing at all, but what reason proceeding from that regal and supreme part, shall for the good and benefit of men, suggest unto thee. And secondly, if any man that is present shall be able to rectify thee or to turn thee from some erroneous persuasion, that thou be always ready to change thy mind, and this change to proceed, not from any respect of any pleasure or credit thereon depending, but always from some probable apparent ground of justice, or of some public good thereby to be furthered; or from some other such inducement.