Calling someone a fool will get you in danger of hellfire according to "Matthew 5:22". But i dont think its super literal, but key pointers

General
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For example. The best example of how to live like a Christian. Would be

Galatians 5:13-26

13 You, my brothers and sisters, were called to be free. But do not use your freedom to indulge the flesh[a]; rather, serve one another humbly in love. 14 For the entire law is fulfilled in keeping this one command: “Love your neighbor as yourself.”[b] 15 If you bite and devour each other, watch out or you will be destroyed by each other.

16 So I say, walk by the Spirit, and you will not gratify the desires of the flesh. 17 For the flesh desires what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are in conflict with each other, so that you are not to do whatever[c] you want. 18 But if you are led by the Spirit, you are not under the law.

19 The acts of the flesh are obvious: sexual immorality, impurity and debauchery; 20 idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions 21 and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.

22 But the fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, 23 gentleness and self-control. Against such things there is no law. 24 Those who belong to Christ Jesus have crucified the flesh with its passions and desires. 25 Since we live by the Spirit, let us keep in step with the Spirit. 26 Let us not become conceited, provoking and envying each other.

To sum it up. When Adam and Eve ate from the tree of death (The forbidden tree, which was a rebelious act, especially against the creator. That led them to learn corrupted knowledge)

The idea is to create harmony, live according to denying ourselves and to serve others. The idea is to figure out what this corrupt nature looks like, and avoid them as much as possible.

For example (Castor Troy) character in Face/Off 1997 movie. To be a Christian, do the complete opposite of that character.

So, what i get out of it. Is keypointers. To avoid sinning we must find freedom in this. Rather than to be slave to what destroys us, aswell as avoiding what we say that can destroy others. Rather we should help each other and lift each other up.

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But i also find the message of Jesus so beautiful. Because, even though i have been angry in my heart. I have reconciled my sins online, due to my lifetime of living like a sinner and not doing anything for those years, and decided to do something by confessing them. And overall, pray we can all forgive each other.

(Matthew 5:23-24)

23 “Therefore, if you are offering your gift at the altar and there remember that your brother or sister has something against you, 24 leave your gift there in front of the altar. First go and be reconciled to them; then come and offer your gift.)