"You have heard that it was said to the people long ago, 'Do not murder, and anyone who murders will be subject to judgment.' But I tell you that anyone who is angry with his brother will be subject to judgment. Again, anyone who says to his brother, 'Raca,' is answerable to the Sanhedrin. But anyone who says, 'You fool!' will be in danger of the fire of hell."
This is one of the most amazing teachings of the Bible. In just a couple of short statements we are all made guilty. No longer can the belief that outward conformity is enough, sin dwells in the heart. You can no longer say that you are good because you haven't murdered, because there is a chance that there is a murderous heart living and beating in your own chest. And the words that we flippantly say out of anger, are words that condemn our own souls.
The need for a savior increases. We are again unworthy to save ourselves.
Consider today your actions toward others. Even when you are treated wrongly. More importantly, consider your heart.