|Truth hurts, huh Doc?|
It was proven by their repentance. You see, when a Christian is shown that they have sinned, they don't argue "Well, no I didn't write that about you" or "I didn't have that attitude" or even "You must have misunderstood me". The response of a Christian is "You're right. I'm sorry".
Let's all pray that God will give us a repentant heart that is sensitive to sin in our lives.