Beware of the anger of the body. Master the body. Let it serve truth. Beware of the anger of the mouth. Master your words. Let them serve truth. Beware of the anger of the mind. Master your thoughts. Let them serve truth.
In a controversy the instant we feel anger we have already ceased striving for the truth, and have begun striving for ourselves. This is a helpful pointer for our everyday presence-practice. Can you catch yourself angrily defending your point of view or attacking the other person's? There's the ego.
Do not believe anything because it is said by an authority, or if it is said to come from angels, or from Gods, or from an inspired source. Believe it only if you have explored it in your own heart and mind and body and found it to be true. Work out your own path, through diligence.
I look upon the judgment of right and wrong as the serpentine dance of a dragon, and the rise and fall of beliefs as but traces left by the four seasons.