要是我来回答这个问题，就是记录、回顾和复盘，学会了就能永久的改变你了你生活。
正文
译者：shawn7xu
原文作者：Yuri-Kruman
出处：https://www.quora.com/If-there-was-one-thing-you-could-learn-that-would-change-your-life-forever-just-one-thing-what-would-it-be-and-why
Yuri-Kruman的回答：“过滤”。
过滤可以提升生活的方方面面，那么这里的过滤指什么？
1、过滤你所吃的。不管是食物还是药物。不要吃垃圾食品，均衡营养。不要轻易用药，药品必须是非吃不可的。
2、过滤你所说的。小心你的言论。先听再说。抓住要点。
3、过滤你所听的和看的。只听那些能充实你生活的人所说的话或者音乐。读那些对你有益的书籍。
4、过滤你所相处的人。你的人生价值是与你最常相处的5个人的平均值。谨慎选择你的朋友圈，远离损友。人生苦短，不要让周围的人阻碍你发展的潜力。
5、过滤你所花费的时间。问问自己，此时此刻我所做的是否能让我向人生目标更近一步？如果不能，马上终止，去做更有价值的事情。比如在睡前不要沉迷在电子设备上。
6、过滤你所获取的信息。去除自己的负面情绪，比如嫉妒、愤怒和厌恶。远离那些浪费你时间的人与物。管理好从电子邮件、网站和社交网络上获取的各种信息，不要让它们占用太多时间。
7、过滤你所信仰的。每个人都会有自己的人生之路和信仰的指引。行动而非空言。
8、定期调整你所过滤的。人总是随着年龄增长不断成熟。30岁时的规则未必适应于40岁。
原文：
The mindset that transcends all aspects of life, both material and spiritual, is…
FILTERING.
What do I mean when I say you must acquire a mindset to FILTER everything that comes your way?
I mean:
Filter what you put in your mouth, whether that’s food or drink or medicine. Don’t let yourself eat or drink junk. Eat a balanced diet. Question the medication prescribed to you to make sure it’s absolutely necessary and has no less harsh or upsetting alternatives.
Filter what comes OUT of your mouth. Watch your speech carefully. Listen first and speak only later. Be concise and to the point. Strive to contribute something positive and useful to the other person when speaking.
Filter what comes into your ears and your eyes. Listen only to people and to music that enrich your life in some way. Avoid things that are harmful to your eyes and mental and physical well-being. Read books that improve your life in some tangible way.
Filter the people you spend time with. You’re the average of the 5 people you spend most of your time with. Choose very carefully and pare away people from your circle that drain your energy and bring bad things like envy/jealousy, gossip/slander and worse. Life is too short to deal with a-holes that prevent you from achieving your potential.
Filter carefully how you spend your time. Ask, is what I'm doing right now getting me closer to my goals as a human, professional, family member, artist, scientist, etc.? If not, drop it and do something more productive/constructive ASAP. Seek meaningful experiences above accumulating material goods that add little to your life. Take a digital Sabbath at least one day a week. Stop all electronics 2–3 hours before bed.
Filter the information streams that come your way. Pare away garbage that brings out the worst human emotions in you (jealousy, envy, anger, hate, etc). Block people and influences in your life that take away from your precious time and ability to focus. Organize your information streams (especially in email, online and on social media) in a way that is manageable, thorough and available for you to access when you have the bandwidth.
Filter your spiritual influences. Each person has his path in life and sooner or later seeks a spiritual guide. Find one that shows before he tells and leads by example. Favor actions over words in those whose model you follow spiritually.
Adjust and clean your filters periodically. People change and mature with age. What worked at 20 may no longer work at 25 or 30 and what did it for you at 30 won’t do at 40. Everything in moderation… Especially moderation :)
Once you’ve acquired a filtering mindset, you will have acquired higher standards, confidence in your own abilities and independence from the many corrupting forces all around you.
Time to get to work!
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