I would say in this order: wise, brave and strong.

Learn how to do it (not everybody knows how to rebut the authority properly)

Have the courage to do it (even if you know how to do it, you need balls to do it. Not everybody have balls)

To stand your ground, NO MATTER WHAT, even if you are threatened with jail or death, you stand your ground. It is only freedom or death. If you know that the truth is on your side, you have nothing to worry.