The Lord Jesus Christ came to this world to manifest the nature and character of God to us. He also came to establish a new covenant between God and mankind through His blood (Luke 22:20). By establishing a new covenant, He did away with the old, Hebrews 8:7-8 says,
“For if that first covenant had been faultless, then should no place have been sought for the second. For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:”

He showed us the character of this new covenant through the relationship He had with the Father while here on earth. And through the words that He spoke. For this reason, we need to pay close attention to the things He said, if we want to reap the full benefits of the new covenant in His blood.

In Matthew 5:21-24, Jesus reveals some of the characteristics of the new covenant. He said that being angry with your brother without a genuine reason is tantamount to murder in the sight of God! For this reason, the Bible in Ephesians 4:26 says:
“Be ye angry, and sin not: let not the sun go down upon your wrath:”

It is even better not to be angry at all because being angry can degenerate into having murderous thoughts. We tend to say things that engender strife when we are angry. For this reason, the wisdom of God in Proverbs 15:1 admonishes us, saying:
“A soft answer turneth away wrath: but grievous words stir up anger.”
Of course you know that most times, you don’t speak soft words when you are angry.

Similarly, Jesus said if you call your brother a fool, you will be in danger of Hell Fire. There are many ways a man can call his brother a fool – not necessarily by the words of mouth alone. When you take a person for granted and take advantage of him or her, you are calling that person a fool. When you cleverly cheat on your spouse, you are calling him or her a fool. In light of these truths, if you have done anything synonymous to murder, you need to repent and make restitution. You may have angrily destroyed the career of a man who has mouths to feed. You have killed such a fellow, because he can no longer perform his obligations as a bread winner. If you are guilty of such, your salvation lies in repentance and restitution: seeking forgiveness from God and the wronged fellow. Whoever has ears, let him give heed to the message of Jesus Christ.  
Written by Pastor E.A. Adeboye.

If God is to judge us by our Getting angry at our 'brother' or calling him a fool in words or deed,then we are all candidates of Hell fire because it is actually a normal occurrence that even the most Revered men of God are guilty of.