Depends on what you mean by
conclusion, which is something a context-sensitive word with too little specification here.
I could probably write five paragraphs and have nine out of ten Christians here agree to it. However, the question itself is large and vague - somewhat like asking "Why does the Earth exist?" - and there's no single, simple, short answer. ("Because of gravity"?)
There are a hundred and fifty thousand words in the New Testament alone, and two thousand years of applying and understanding them, millions of words written on their interpretation, and a billion Christians each with their own lives.
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My scribbles on how to be a good Christian:
-Love your fellow man. This is normally rendered "neighbor", which I feel misses the usage of it to refer to any other man you happen to meet regardless of nation or religion. In the words of CS Lewis: "You have never met a 'mere' mortal." Do not write groups off as/with stereotypes, but seek to understand their people. Do not write people off for ever, but offer them forgiveness. Do not discount foreigners. Offer love and grace and kindness to everyone. Be charitable as matter of doing the right thing and not because you expect to reap benefits of it, which leads handily to the next point:
-Do things because they are right. Act virtuously. Throw out your selfishness. Do the right thing if it is ever opposed to the easy thing or the pleasurable thing or the rewarding thing. There is nothing wrong with having other motivations, but they should be secondary. I generally find that my other motivations either are evil, or get satisfied anyway when I do the right thing. And when I am self-effacing, I find people telling me that I'm their role model.
-Pray. Say prayers of thanksgiving when you are happy. Say prayers of lamentation when you have lost something. Complain to God when life is bad. Ask God for counsel, healing, blessings. Even more, ask for wisdom, which improves all the other aspects, and so that you can say right prayers. ("God, I don't want to work. Please give me a million dollars. Amen" is usually a blasphemy, not a prayer.) Commune with God and grow closer to Him.
-Read the Bible. Read especially what Jesus said and what the early apostles/disciples wrote to one another and as advice to the churches. Use these to derive any principles that I may have missed or forgotten. Then go and read
about the Bible, too, and learn the cultural context and nuances that are largely lost in our modern society. Feasts and famines are largely a thing of the past to most of us, as are planting and harvest. A simple example:
"He who continually goes forth weeping,
Bearing seed for sowing,
Shall doubtless come again with rejoicing,
Bringing his sheaves with him."
Weeping? In poor agrarian societies, every handful of seed sowed is one that can't be stored or eaten, in a time and place where starvation is a very real threat. How many of you reading this have ever had to balance going hungry now against having food next year? More likely anything that you don't eat now will be stale and rotten in a month.
-Rely on God. As John Ortberg puts it, if you want to walk on water, you have to get out of the boat. Put your life in God's hands and trust Him to hold you. This is related to prayer: if you need a miracle to get something done, pray for it, then start working, and wait and expect the miracle to come along. (But I warn again, because a lot of people are bent on misinterpreting this, this is not a money dispenser or a magical panacea. Ask for wisdom, like Solomon, to ask for the right things.) Most famous in this area is possibly the paraphrase from 1 Philippians: "he who began a good work in you..."
-Act. This relates to a great many of the other points. Put your faith into practice. Turn the words into works. Find someone to forgive, someone to love, someone to help. Find errors to correct and wrongs to right. Treat the words of Jesus as commands to be followed, not just quotes to be remembered.
-Accumulate good servants. Money is the canonical example of a good servant but a poor master. Knowledge and power are others. Seek to gain as much as is healthy of these and to put them to good use. Which again leads neatly to the next point:
-Exercise and practice judgement. The world is not all of one piece. People will stand against one another and lie and disagree and argue and fight and make war. You must exercise judgement as best you can, and train yourself to become better, and ask God for guidance, and observe the results of what you have wrought. Do not shrink from reality and say "but I did what I thought was best". Do not let labels or stereotypes substitute for thought. Be willing to discard old prejudices if they are contradicted by new information. (This ties into Love your fellow man, above.) Rebuke people when they are wrong, and don't lie to spare people's feelings. Be also careful of "I did the best I could"; far too often I see it as an excuse for not becoming able to do better. Again, another point worthy of separate mention:
-Try to be like Jesus. Jesus was perfect and you aren't and won't be in this life. I know this perfectly well, now stop using it as an excuse to not try to improve yourself. Any goal lower than perfection opens up the possibility of stopping short when there are still rectifiable errors.
-Be abstentious. IMO, too many people interpret this as applying to sex and too few as applying to e.g. power. The world is full of habit-forming things and demons trying to use them to distract you to evil. Find joy in Christ. If I were to pick a word to describe the attitude I try to hold to this world, it might be "amusing".
-Seek the spirit and not the letter of the law. Many of these goals are related to and can be derived from one another, not least because I am writing them in the same spirit, the spirit that I am trying to follow. Be ready to reconsider if one of these points grates on all the others. (On the other hand, try to be sure that you are comparing it to the actual spirit and not to your personal prejudices.) Another important aspect of this is to look for intent rather than nitpicking over apparent contradictions. There are some things where a middle road is advisable and going too far to the left and too far to the right are both dangerous, and there are times to turn metaphorically left, and times to turn metaphorically right, and setting "turn left" up against "keep right" out of context is unhelpful.
-Be together with someone. Find a congregation, get married, join a hobby club, play a team sport, etc. It is not good for man to be alone. Being part of a congregation gives you someone to help you find the spirit of the law as mentioned above with less danger of running into your own prejudices. Being married is a wonderful thing which will bring more love and happiness into your life. Being together with other humans at all is a good thing, so that you can learn love for all humanity and can be preserved from apathy and inward-turnedness of the soul.
-Spread the word. This is a good thing. Pass it on.
Anything I missed?
Edit: Bigfoot suggested that these deserve separate points.
Repentance. People are not perfect, and there are times when we make mistakes. Fortunatley, God knows this, and offers a way to redeem ones self through repentance. By repenting, you are expressing your remorse over your wrongdoing and then being reconciled, when you recieve Gods forgiveness. There is no sin, no matter how grave, that cannot be forgiven. Remember, you can only recieve reconciliation if you are truly sorry for your sins. It is never too late to repent. As he was being crucified along with the two criminals, one of the criminals said to Jesus, "Jesus, remember me when you come into your kingdom," to which Jesus replied, "I tell you the truth, today you will be with me in paradise." Luke 23:42-43.
By the same token, Christians must also practice...
-Forgiveness. Christians are not supposed to hold grudges. When someone does you wrong, no matter how much, Christians are obligated to forgive that person. Why? Because God knows only forgiveness, and nothing of revenge. It's not the easy way, but it's the best way, because two wrongs don't make a right. Even as he was being crucified, Jesus called out "Father, forgive them, for they do not know what they are doing." Luke 23:34.
Both of these principles are examplified in these lines of the Lord's Prayer:
"...and forgive us our tresspasses, as we forgive those who tresspass against us..."