1. Friends Come and Go
Friends will always come and go in your life; It can be a hard thing to accept, but many of the friends you spend time with now, might not be around in the next few years.
2. You Won't Always Get What You Want
You won't always get what you want in life: people are going to be late, people will let you down, items you want won't always be available.
Important Lesson: Don't look for happiness in material possessions and if things don't go your way, learn to accept them. Life's too short to stay miserable.
3. Many People Will Love You, but Many Will Not
Whether you are a celebrity, a charity worker or just a normal guy, there are going to be people that love you and what you do, but there's also going to be plenty people that don't like you. There are many possible reasons such as jealousy, similarities to them, or just not being someone's 'type'.
Important Lesson: Not everyone is always going to like you, and that's fine. If people want to spend time talking about you then that is their problem. You are perfect as you are. You shouldn't need everyone to like you to have some form of self-esteem.
4. Nobody Can Transform Your Life Like You Can
The support and help of others can only take you so far, you're going to have to do your own thing to make big changes in your life situation.
Important Lesson: Do things for yourself and learn to stand on your own two feet. People you rely on won't be around forever, and you don't want to have to use others as a crutch to get anywhere in life.
5. Mistakes are part of Life
As the saying goes - "Only those who are asleep make no mistakes". or "Those who don't make mistakes, usually don't do anything!"
Important Lesson: You can learn a lot from others, but it is your own failures that are going to teach you the most valuable lessons in life. Learn from your failures, embrace them, and use them to drive you on to success.
6. Not everyday is Perfect
Don't stress about the things that you can't control. Learn to live with things that happen. You can't change the past, but you can change how you react to things.
7. There May Be No Tomorrow
At least, not for you anyway. We never know what is around the corner, a car crash, a heart attack; heck...even the end of the world is possible. Let's face it, although we would all like to live till we are 70 years old, that's certainly not always the case. There will be one day that is our last.
Important Lesson: Make the most of each day. Make sure the people you care about actually know it, don't worry about little matters, just make sure you spend time doing the things you love.
8. Someone Else Will Always Have More
Whether it is money, partners, friends or even blog subscribers, there will always be areas where other people have more than you. That isn't to say you can't become abundant in whatever you want..
Important Lesson: Just because someone has 'more', that doesn't mean they are happy.
Excerpt from http://www.dumblittleman.com