My dear brothers, take note of this: Everyone should be quick to listen, slow to speak and slow to become angry, for man's anger does not bring about the righteous life that God desires.James 1:19, NIV
Standing for the absolute truth that resides with God should be foremost to resist this temptation. At the same time, anger, character assassination, and a sharp tongue do not determine truth. This is how people who believe that truth is relative try to change the truth. Anger does not make what a person says any more true. In fact, it doesn't even show that a person has confidence in what one says, but actually a lack of confidence (see You Say I'm A Liar? by J. Budziszewski). The ability to listen and to disagree with love and concern shows confidence. Truth does not depend on us or on our ability to understand it. Truth depends on God.