judge, jury and executioner

Romans 2:1-4

Observe:
The word that gets repeated here a lot is "judge" or "judgement". Paul contrasts the hypocritical judgement of humans against the righteous judgement of God (v. 2). He also makes some comparison between the quickness of humans to judge and the patience and kindness of God which leads to repentance.
Paul uses the phrase "without excuse" again (1:20 and 2:1) in conjunction with the judgement of God. It seems like this passage is addressed to people who have some knowledge of the law - possibly Jews or Jewish Christians - whereas chapter 1 was addressed to the barbarians who had no knowledge of the law. .

Interpret.
Both groups are without excuse - the barbarians because they can see the attributes of God in creation and the Jews because they know the requirements of the law, the consequences of breaking the law but continue to sin anyway (1:32) while passing judgement on everyone else. This was very typical of the Pharisees and Paul's words echo the words of Jesus.
Paul (echoing Jesus again) is not saying that we should not judge other people's actions but that we should not do so from a hypocritical place. Our judgement must be based on truth, like God's is. In fact, in other passages, Paul tells us to judge others.
Paul is saying that those who are quick to judge are impatient with God. God's slowness is not because he is hesitant or weak but because he is kind and patient and wants to give people every chance to repent before he judges them.

Application:
I am too quick to be judge, jury and executioner. I am too quick to pass judgement and condemnation. I need the Spirit to change my attitude to make me more merciful and patient - content to let God judge. I still have the responsibility to point out sin but my goal should not be making people feel shame but to bring them to repentance and back on the right path.
I am a hypocritical judge - often condemning people for the very same things that I do. I think that this is a function of my guilty conscience: if I can point it out in others, I don't have to attend to it in my own life.
This passage shows me that God's judgement will be based on truth. It won't be based on whether or not he got enough sleep that day, whether someone cut him off in traffic or anything like that. God is just and his judgement will be just.
God is also patient which is a very good thing. Sometimes when I look around at all the injustice and sinfulness in the world, I get impatient with God. So many people are suffering and God could step in at any time. The truth is that I want him to step in quickly to cut off others but I want him to be patient with me. I can't have it both ways.
I am glad that God is rich in kindness and I am sorry for showing contempt for that.